BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Avalanche Instability as Nonequilibrium Quantum Criticality DTSTART;VALUE=DATE-TIME:20240926T023000Z DTEND;VALUE=DATE-TIME:20240926T025500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-628@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Jong Han (SUNY at Buffalo)\nA fundamental instabilit y in the nonequilibrium conduction band under an\nelectric field bias occu rs via the spontaneous emission of coherent\nphonons. Analytic theory\, su pported by numerical calculations\,\nestablishes that the quantum avalanch e\, an abrupt nonequilibrium\noccupation of excited bands\, results from t he competition between the\ncollapse of the band minimum via the phonon em ission and the dephasing\nof the electron with the environment. The contin uous avalanche\ntransition is a quantum phase transition with the nonequil ibrium phase\ndiagram determined by the avalanche parameter $\\beta$. We f urther\nconfirm the nature of the quantum avalanche with the temperature\n dependence.\n\n[1] X. Chen and J. E. Han\, Avalanche Instability as Nonequ ilibrium\nQuantum Criticality\, Phys. Rev. B 109\, 054307 (2024).\n[2] J. E. Han et al\, Correlated insulator collapse due to quantum\navalanche via in-gap ladder states\, Nat. Comm. 14\, 2936 (2023).\n[3] J. Nathawat et a l\, Signatures of hot carriers and hot phonons in the\nre-entrant metallic and semiconducting states of Moiré-gapped graphen\,\nNat. Comm. 14\, 150 7 (2023).\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/628/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/628/ END:VEVENT BEGIN:VEVENT SUMMARY:Closing DTSTART;VALUE=DATE-TIME:20240927T031000Z DTEND;VALUE=DATE-TIME:20240927T031500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-708@project.ccs.tsukuba.ac.jp DESCRIPTION:Proceedings\nRPMBT23\n\nhttps://project.ccs.tsukuba.ac.jp/even t/23/contributions/708/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/708/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum many-body dynamics in digital quantum computers DTSTART;VALUE=DATE-TIME:20240926T010000Z DTEND;VALUE=DATE-TIME:20240926T013000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-707@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Seiji Yunoki (RIKEN)\nOwning to the recent rapid adv ancement of quantum technologies\, digital quantum computers with more tha n 100 qubits have emerged as a new platform to explore quantum many-body d ynamics that may potentially be out of reach for classical computers. In t his talk\, I will introduce some of the recent progress in this direction and present our recent studies. In particular\, I will discuss our recent investigation of the dynamics of periodically driven systems using an IBM Quantum Heron processor\, focusing on the emergence of discrete time cryst als (DTCs) and discrete time quasicrystals (DTQCs) in two spatial dimensio ns [1]. Our study\, based on a kicked Ising model with 133 qubits\, reveal s a prethermal regime characterized by magnetization oscillations. We obse rve period-doubling DTCs and discover DTQCs induced by the longitudinal fi eld. Our findings\, supported by classical simulations based on state vect or methods as well as tensor network methods\, shed light on out-of-equili brium dynamics in quantum systems and highlight the potential of digital q uantum computers for studying many-body systems. \n[1] K. Shinjo\, K. Seki \, T. Shirakawa\, R.-Y. Sun\, and S. Yunoki\, “Unveiling clean two-dimen sional discrete time quasicrystal on a digital quantum computer”\, arXiv :2403.16718.\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/7 07/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/707/ END:VEVENT BEGIN:VEVENT SUMMARY:Understanding correlated d- and f-electron systems using DFT and e DMFT methods DTSTART;VALUE=DATE-TIME:20240924T025500Z DTEND;VALUE=DATE-TIME:20240924T032000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-626@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Khandker Quader (Department of Physics\, Kent State University\, Kent\, OH\, USA)\nAbstract (PDF)\n\nUse Own PC\n\nhttps://pro ject.ccs.tsukuba.ac.jp/event/23/contributions/626/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/626/ END:VEVENT BEGIN:VEVENT SUMMARY:Ab initio structural optimization at finite temperatures based on anharmonic phonon theory DTSTART;VALUE=DATE-TIME:20240924T022500Z DTEND;VALUE=DATE-TIME:20240924T025500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-705@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Arita Ryotaro (Department of Physics\, University of Tokyo)\nIn this presentation\, I will report on the development of first- principles structural optimization at finite temperatures and their applic ations. At zero temperature\, structural optimization commonly involves mi nimizing the energy of the system based on density functional theory. Howe ver\, it is necessary to consider minimizing the free energy at finite tem peratures. In doing so\, it is essential to consider the contributions of phonons\, including anharmonic terms. We have formulated a method based on anharmonic phonon theory. In particular\, we developed a technique for ef ficiently evaluating the interatomic force constant\, which we applied to BaTiO3 and LiBO3 (B=Ta\, W\, Re\, Os). Our method has been found to accura tely evaluate the experimental transition temperatures of structural phase transitions in both insulators and metals.\n\n[1]R. Masuki\, T. Nomoto\, R\, Arita\, and T. Tadano\, Phys. Rev. B 106. 224104 (2022)\n[2]R. Masuki\ , T. Nomoto\, R\, Arita\, and T. Tadano\, Phys. Rev. B 110\, 094102 (2024) \n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/705/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/705/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] Accurate relativistic exchange energy functional for at omic nuclei DTSTART;VALUE=DATE-TIME:20240924T082700Z DTEND;VALUE=DATE-TIME:20240924T082800Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-701@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: QIANG ZHAO (Research Center for Nuclear Physics\, Os aka University)\nThe shell evolution towards the extreme neutron-to-proton ratio has been a pivotal focus in nuclear physics over recent decades\, s ince it is crucial to understand the effective nucleon-nucleon interaction s and the r-process. Significant efforts have been devoted to deciphering the mechanism behind the shell evolution\, such as the spin-orbit interact ion\, the tensor force\, and the pseudospin symmetry. This motivates us to include the exchange energy in the relativistic density functional theory to simultaneously consider the important mechanisms in a self-consistent way.\n\nThe inclusion of nucleonic exchange energy has been a long-standin g challenge for the relativistic density functional theory in nuclear phys ics. We propose an orbital-dependent relativistic Kohn-Sham density functi onal theory to incorporate the exchange energy with local Lorentz scalar a nd vector potentials. The relativistic optimized effective potential equat ions for the local exchange potentials are derived and solved efficiently. The obtained binding energies and charge radii for nuclei are benchmarked with the results given by the traditional relativistic Hartree-Fock appro ach\, which involves intractable nonlocal potentials. It demonstrates that the present framework is not only accurate but also efficient. An extensi on to three-dimensional coordinate space is also realized\, which would ha ve great potential for wide applications.\n\nhttps://project.ccs.tsukuba.a c.jp/event/23/contributions/701/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/701/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] A Theoretical Study on Spin-Filter Effect in Layered Ma terials DTSTART;VALUE=DATE-TIME:20240924T082500Z DTEND;VALUE=DATE-TIME:20240924T082600Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-699@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Jin Inoue (Kanazawa University)\nAbstract (PDF)\n\nh ttps://project.ccs.tsukuba.ac.jp/event/23/contributions/699/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/699/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] The impact of connectivity in qubit networks and the sy mmetry in the XY model on the quantum machine learning’s performance DTSTART;VALUE=DATE-TIME:20240924T082400Z DTEND;VALUE=DATE-TIME:20240924T082500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-698@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Aoi Hayashi (SOKENDAI (The Graduate University for A dvanced Studies)\, Okinawa Institute of Science and Technology\, National Institute of Informatics)\nAbstract (PDF)\n\nhttps://project.ccs.tsukuba.a c.jp/event/23/contributions/698/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/698/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] Coulomb interaction-driven entanglement of electrons on helium DTSTART;VALUE=DATE-TIME:20240924T082300Z DTEND;VALUE=DATE-TIME:20240924T082400Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-697@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Oskar Leinonen (University of Oslo)\nThe generation and evolution of entanglement in many-body systems is an active area of re search that spans multiple fields\, from quantum information science to th e simulation of quantum many-body systems encountered in condensed matter\ , subatomic physics\, and quantum chemistry. Motivated by recent experimen ts exploring quantum information processing systems with electrons trapped above the surface of cryogenic noble gas substrates\, this talk will pres ent an theoretical investigation of the generation of *motional* entanglem ent between two electrons via their unscreened Coulomb interaction. The mo del system consists of two electrons confined in separate electrostatic tr aps which establish microwave-frequency quantized states of their motion. We have computed the motional energy spectra of the electrons\, as well as their entanglement\, by diagonalizing the model Hamiltonian with respect to a single-particle Hartree product basis. The computational procedure ou tlined here can be employed for device design and guidance of experimental implementations. In particular\, the theoretical tools developed here can be used for fine tuning and optimization of control parameters in future experiments with electrons trapped above the surface of superfluid helium or solid neon. \n\nThe talk is based on the paper "Coulomb interaction-dri ven entanglement of electrons on helium" by Beysengulov\, Schøyen\, Bilek \, Flaten\, Leinonen\, et al. [1]\, which is currently under review. \n\n[ 1] https://arxiv.org/abs/2310.04927\n\nhttps://project.ccs.tsukuba.ac.jp/e vent/23/contributions/697/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/697/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] Effect of the Coulomb interaction on nuclear deformatio n and drip lines DTSTART;VALUE=DATE-TIME:20240924T082200Z DTEND;VALUE=DATE-TIME:20240924T082300Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-696@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Kenta Hagihara (University of Tsukuba)\nThe energy d ensity functional method is able to provide systematic analysis on propert ies of nuclei all over the nuclear chart.\nWe perform the calculations for nuclei from the proton to the neutron drip lines including superheavy nuc lei.\nUsing HFBTHO program(Axially deformed solution of the Skyrme-Hartree –Fock–Bogoliubov equations using the transformed harmonic oscillator b asis (II))\, the effect of Coulomb interaction on the detormation of even- even nuclei and drip line is reported.\nThe results show that the Coulomb interaction increases the deformation of nuclei in the large mass number r ange and stretches the drip line toward the neutron side.\nIt is interesti ng to find that the Coulomb interaction gives additional binding to nuclei near the neutron drip line.\nIn order to understand microscopic mechanism s of these effects\, we plan to report results of calculations with constr aints on deformation\, radius\, etc.\n\nhttps://project.ccs.tsukuba.ac.jp/ event/23/contributions/696/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/696/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] Automatic Structural Search of Tensor Network States in cluding Entanglement Renormalization DTSTART;VALUE=DATE-TIME:20240924T082100Z DTEND;VALUE=DATE-TIME:20240924T082200Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-695@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Ryo Watanabe (Osaka University)\nWhen the entangleme nt structure of the quantum state of interest is non-uniform in real space \, accurately representing the state with a limited number of degrees of f reedom hinges on appropriately configuring the Tensor Network (TN) to alig n with the entanglement pattern. Although TN states including entanglement renormalization (ER) can encompass a wider variety of entangled states\, a proposal has yet to show a structural search of ER due to its high compu tational cost and the lack of flexibility in its algorithm. In this study\ , we conducted an optimal structural search of TN\, including ER\, based o n the reconstruction of their local structures with respect to variational energy. Firstly\, we demonstrated that our algorithm for the spin-1/2 tet ramer singlets model could calculate exact ground energy using the multi-s cale entanglement renormalization ansatz (MERA) structure as an initial TN structure. Subsequently\, we applied our algorithm to the random XY model s with the two initial structures: MERA and the suitable structure underly ing the strong disordered renormalization group. We found that\, in both c ases\, our algorithm achieves improvements in variational energy\, fidelit y\, and entanglement entropy. The degree of improvement in these quantitie s is superior in the latter case compared to the former\, suggesting that utilizing an existing TN design method as a preprocessing step is importan t for maximizing our algorithm's performance.\n\nhttps://project.ccs.tsuku ba.ac.jp/event/23/contributions/695/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/695/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] Evolution of chirality in the electron-positron pair pr oduction driven by photons DTSTART;VALUE=DATE-TIME:20240924T082000Z DTEND;VALUE=DATE-TIME:20240924T082100Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-694@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Chengpeng Yu (University of Tsukuba)\nAbstract (PDF) \n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/694/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/694/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] Double beta decay phase space factor calculation using Coulomb potential calculated by mean field calculation DTSTART;VALUE=DATE-TIME:20240924T081900Z DTEND;VALUE=DATE-TIME:20240924T082000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-693@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Atsuya Kanai (University of Tsukuba)\nAbstract (PDF) \n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/693/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/693/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] Large-scale shell model study of $\\mathbf{\\beta^-}$-d ecay properties of $\\mathbf {N=126\, 125}$ nuclei along the $r$-process path DTSTART;VALUE=DATE-TIME:20240924T081800Z DTEND;VALUE=DATE-TIME:20240924T081900Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-692@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Anil Kumar (Center for Computational Sciences\, Univ ersity of Tsukuba\, Tsukuba\, Japan)\nThe rapid neutron capture process ($ r$-process) is the most important mechanism for the synthesis of about hal f of the elements heavier than iron. It occurs in an environment with rela tively high temperatures and high neutron densities. The abundances of the elements created by the $r$-process strongly depend on several nuclear in puts like masses\, neutron capture rates\, $\\beta$-decay rates\, and $\\b eta$-delayed neutron emission probabilities at the waiting point nuclei. A mong them\, the $\\beta$-decay process plays a crucial role in the $r$-pro cess. In this work\, we have investigated various nuclear $\\beta$-decay p roperties of $N = 126\, 125$ isotones with proton numbers $Z=52-79$ within the framework of the nuclear shell model. This comprehensive analysis con sidered both Gamow-Teller (GT) and first-forbidden (FF) transitions to eva luate $\\beta$-decay rates. We have found that including FF transitions in addition to GT transitions is essential\, as they significantly impact th e total $\\beta$-decay half-lives near $Z = 82$. Additionally\, we systema tically analyzed the GT strength distributions as a function of proton num ber. We have observed that the GT strengths at low excitation energies are rather strong on the proton deficient side due to the increasing number o f proton holes in the proton $0h_{11/2}$ orbit\, which accelerates GT deca y. This investigation aims to provide detailed information on $\\beta$-de cay properties around $A\\approx 195$ to understand the distribution of th e third $r$-process abundance peak.\n\nhttps://project.ccs.tsukuba.ac.jp/e vent/23/contributions/692/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/692/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] Superfluid Band Theory for the Neutron Star Inner Crust DTSTART;VALUE=DATE-TIME:20240924T081700Z DTEND;VALUE=DATE-TIME:20240924T081800Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-691@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Kenta Yoshimura (Tokyo Institute of Technology)\nIn the inner crust of neutron stars\, a Coulomb lattice of nuclei exists\, im mersed in a sea of superfluid neutron gas. The interplay between these nuc lear crystals and the background neutrons may significantly alter nuclear dynamics\, a phenomenon known as the "entrainment" effect\, which is cruci al for understanding several astronomical phenomena.\n\nIn our study\, we have developed new self-consistent calculations that fully account for bot h superfluid effects and band structure effects. We have extracted the "ef fective mass" of free neutrons through the real-time method.\n\nIn this pr esentation\, we will show the formalism and methodology of our calculation s\, as well as further extensions towards comprehensive simulations of the subnuclear properties of neutron star matter.\n\nhttps://project.ccs.tsuk uba.ac.jp/event/23/contributions/691/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/691/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] The rotational mode caused by the pair condensation in nuclei DTSTART;VALUE=DATE-TIME:20240924T081600Z DTEND;VALUE=DATE-TIME:20240924T081700Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-690@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Chisato Ruike (University of Tsukuba)\nAbstract (PDF )\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/690/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/690/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] Nuclear structure study using a hybrid approach of shel l model and Gogny-type density functionals DTSTART;VALUE=DATE-TIME:20240924T081500Z DTEND;VALUE=DATE-TIME:20240924T081600Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-689@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Kota Yoshinaga (Unversity of Tsukuba)\nThe Gogny-typ e density functionals have finite-range and density-dependent terms. The p arameters of the functionals are designed not only to reproduce the basic properties of finite nuclei but also to satisfy the saturation properties of nuclear matter. Consequently\, calculations using a single density func tionals can describe experimental data in various mass regions. However\, the mean-field calculations using the functionals miss some corrections. I n contrast\, there are semi-empirical methods that construct a shell-model Hamiltonian by fitting experimental values. The shell-model (configuratio n interaction) calculations can take into account correlations beyond mean fields\, but we have to determine the model space and then fit the effect ive interactions with experimental results.\nIn this study\, a hybrid appr oach is attempted by applying a method using the Gogny-type density functi onals to shell-model calculations. The resultant density-dependent interac tion of the shell-model Hamiltonian is self-consistently determined. The g oal of the present study is to extend a previous application to the sd-she ll region to heavier regions.\nIn this presentation\, we will present resu lts for the pf-shell nuclei in comparison with the experimental results. I n particular\, we will focus on the calculation with the isospin-dependent tensor force\, and show that the isospin dependence is necessary to descr ibe characteristics in neutron-rich nuclei.\n\nhttps://project.ccs.tsukuba .ac.jp/event/23/contributions/689/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/689/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] Shape fluctuation in low-lying states in $N \\approx 40 $ neutron-rich nuclei DTSTART;VALUE=DATE-TIME:20240924T081400Z DTEND;VALUE=DATE-TIME:20240924T081500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-687@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Kouhei Washiyama (University of Tsukuba)\nAbstract ( PDF)\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/687/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/687/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] Variational method with an explicit energy functional f or neutron matter at finite temperature taking into account the spin-orbit force DTSTART;VALUE=DATE-TIME:20240924T081300Z DTEND;VALUE=DATE-TIME:20240924T081400Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-686@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Kento Kitanaka (Department of Physics and Applied Ph ysics\, Waseda Univesity)\nAbstract (PDF)\n\nhttps://project.ccs.tsukuba.a c.jp/event/23/contributions/686/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/686/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] Variational method with an explicit energy functional f or symmetric nuclear matter taking into account the spin-orbit force DTSTART;VALUE=DATE-TIME:20240924T081200Z DTEND;VALUE=DATE-TIME:20240924T081300Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-685@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Toshiya Osuka (Department of Physics and Applied Phy sics\, Waseda University)\nAbstract (PDF)\n\nhttps://project.ccs.tsukuba.a c.jp/event/23/contributions/685/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/685/ END:VEVENT BEGIN:VEVENT SUMMARY:[Indexing] Self-consistent renormalization theory of anisotropic s pin fluctuations in nearly ferromagnetic metals DTSTART;VALUE=DATE-TIME:20240924T081000Z DTEND;VALUE=DATE-TIME:20240924T081100Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-683@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Rikio Konno (Kindai University Technical College )\ nAbstract (PDF)\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contribution s/683/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/683/ END:VEVENT BEGIN:VEVENT SUMMARY:Self-consistent renormalization theory of anisotropic spin fluctua tions in nearly ferromagnetic metals DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-680@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Rikio Konno (Kindai University Technical College )\ nAbstract (PDF)\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contribution s/680/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/680/ END:VEVENT BEGIN:VEVENT SUMMARY:Realizing Topological Quantum Walks on NISQ Digital Quantum Comput er DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-679@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Mrinal Kanti Giri (National Tsing-Hua University)\nW e study the quantum walk on the off-diagonal Aubry-André-Harper (AAH) lat tice with periodic modulation using a digital quantum computer. We investi gate various initial states at the single-particle level\, considering dif ferent hopping modulation strengths and phase factors. Initiating the quan tum walk with a particle at the lattice edge reveals the robustness of the edge state\, attributed to the topological nature of the AAH model\, and displays the influence of the phase factor on this edge state. On the othe r hand\, when the quantum walk begins with a particle in the lattice bulk\ , we observe a repulsion of the bulk walker from the edge\, especially und er strong hopping modulation. Furthermore\, we extend our investigation to the quantum walk of two particles with nearest-neighbour (NN) interaction . We show the repulsion effect in the quantum walk when two walkers origin ate from the edge and bulk of the lattice due to the interaction. Addition ally\, when two particles are positioned at NN sites and subjected to stro ng hopping modulation strength\, they exhibit localization in the presence of interaction. We analyze these phenomena by examining physical quantiti es such as density evolution\, two-particle correlation\, and participatio n entropy\, and discuss their potential applications in quantum technologi es.\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/679/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/679/ END:VEVENT BEGIN:VEVENT SUMMARY:The impact of connectivity in qubit networks and the symmetry in t he XY model on the quantum machine learning’s performance DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-667@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Aoi Hayashi (SOKENDAI (The Graduate University for A dvanced Studies)\, Okinawa Institute of Science and Technology\, National Institute of Informatics)\nAbstract (PDF)\n\nhttps://project.ccs.tsukuba.a c.jp/event/23/contributions/667/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/667/ END:VEVENT BEGIN:VEVENT SUMMARY:Automatic Structural Search of Tensor Network States including Ent anglement Renormalization DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-666@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Ryo Watanabe (Osaka University)\nWhen the entangleme nt structure of the quantum state of interest is non-uniform in real space \, accurately representing the state with a limited number of degrees of f reedom hinges on appropriately configuring the Tensor Network (TN) to alig n with the entanglement pattern. Although TN states including entanglement renormalization (ER) can encompass a wider variety of entangled states\, a proposal has yet to show a structural search of ER due to its high compu tational cost and the lack of flexibility in its algorithm. In this study\ , we conducted an optimal structural search of TN\, including ER\, based o n the reconstruction of their local structures with respect to variational energy. Firstly\, we demonstrated that our algorithm for the spin-1/2 tet ramer singlets model could calculate exact ground energy using the multi-s cale entanglement renormalization ansatz (MERA) structure as an initial TN structure. Subsequently\, we applied our algorithm to the random XY model s with the two initial structures: MERA and the suitable structure underly ing the strong disordered renormalization group. We found that\, in both c ases\, our algorithm achieves improvements in variational energy\, fidelit y\, and entanglement entropy. The degree of improvement in these quantitie s is superior in the latter case compared to the former\, suggesting that utilizing an existing TN design method as a preprocessing step is importan t for maximizing our algorithm's performance.\n\nhttps://project.ccs.tsuku ba.ac.jp/event/23/contributions/666/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/666/ END:VEVENT BEGIN:VEVENT SUMMARY:Evolution of chirality in the electron-positron pair production dr iven by photons DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-665@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Chengpeng Yu (University of Tsukuba)\nAbstract (PDF) \n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/665/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/665/ END:VEVENT BEGIN:VEVENT SUMMARY:Nuclear structure study using a hybrid approach of shell model and Gogny-type density functionals DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-664@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Kota Yoshinaga (Unversity of Tsukuba)\nThe Gogny-typ e density functionals have finite-range and density-dependent terms. The p arameters of the functionals are designed not only to reproduce the basic properties of finite nuclei but also to satisfy the saturation properties of nuclear matter. Consequently\, calculations using a single density func tionals can describe experimental data in various mass regions. However\, the mean-field calculations using the functionals miss some corrections. I n contrast\, there are semi-empirical methods that construct a shell-model Hamiltonian by fitting experimental values. The shell-model (configuratio n interaction) calculations can take into account correlations beyond mean fields\, but we have to determine the model space and then fit the effect ive interactions with experimental results.\nIn this study\, a hybrid appr oach is attempted by applying a method using the Gogny-type density functi onals to shell-model calculations. The resultant density-dependent interac tion of the shell-model Hamiltonian is self-consistently determined. The g oal of the present study is to extend a previous application to the sd-she ll region to heavier regions.\nIn this presentation\, we will present resu lts for the pf-shell nuclei in comparison with the experimental results. I n particular\, we will focus on the calculation with the isospin-dependent tensor force\, and show that the isospin dependence is necessary to descr ibe characteristics in neutron-rich nuclei.\n\nhttps://project.ccs.tsukuba .ac.jp/event/23/contributions/664/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/664/ END:VEVENT BEGIN:VEVENT SUMMARY:Effect of the Coulomb interaction on nuclear deformation and drip lines DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-662@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Kenta Hagihara (University of Tsukuba)\nThe energy d ensity functional method is able to provide systematic analysis on propert ies of nuclei all over the nuclear chart.\nWe perform the calculations for nuclei from the proton to the neutron drip lines including superheavy nuc lei.\nUsing HFBTHO program(Axially deformed solution of the Skyrme-Hartree –Fock–Bogoliubov equations using the transformed harmonic oscillator b asis (II))\, the effect of Coulomb interaction on the detormation of even- even nuclei and drip line is reported.\nThe results show that the Coulomb interaction increases the deformation of nuclei in the large mass number r ange and stretches the drip line toward the neutron side.\nIt is interesti ng to find that the Coulomb interaction gives additional binding to nuclei near the neutron drip line.\nIn order to understand microscopic mechanism s of these effects\, we plan to report results of calculations with constr aints on deformation\, radius\, etc.\n\nhttps://project.ccs.tsukuba.ac.jp/ event/23/contributions/662/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/662/ END:VEVENT BEGIN:VEVENT SUMMARY:Large-scale shell model study of $\\mathbf{\\beta^-}$-decay proper ties of $\\mathbf {N=126\, 125}$ nuclei along the $r$-process path DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-660@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Anil Kumar (Center for Computational Sciences\, Univ ersity of Tsukuba\, Tsukuba\, Japan)\nThe rapid neutron capture process ($ r$-process) is the most important mechanism for the synthesis of about hal f of the elements heavier than iron. It occurs in an environment with rela tively high temperatures and high neutron densities. The abundances of the elements created by the $r$-process strongly depend on several nuclear in puts like masses\, neutron capture rates\, $\\beta$-decay rates\, and $\\b eta$-delayed neutron emission probabilities at the waiting point nuclei. A mong them\, the $\\beta$-decay process plays a crucial role in the $r$-pro cess. In this work\, we have investigated various nuclear $\\beta$-decay p roperties of $N = 126\, 125$ isotones with proton numbers $Z=52-79$ within the framework of the nuclear shell model. This comprehensive analysis con sidered both Gamow-Teller (GT) and first-forbidden (FF) transitions to eva luate $\\beta$-decay rates. We have found that including FF transitions in addition to GT transitions is essential\, as they significantly impact th e total $\\beta$-decay half-lives near $Z = 82$. Additionally\, we systema tically analyzed the GT strength distributions as a function of proton num ber. We have observed that the GT strengths at low excitation energies are rather strong on the proton deficient side due to the increasing number o f proton holes in the proton $0h_{11/2}$ orbit\, which accelerates GT deca y. This investigation aims to provide detailed information on $\\beta$-de cay properties around $A\\approx 195$ to understand the distribution of th e third $r$-process abundance peak.\n\nhttps://project.ccs.tsukuba.ac.jp/e vent/23/contributions/660/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/660/ END:VEVENT BEGIN:VEVENT SUMMARY:Superfluid Band Theory for the Neutron Star Inner Crust DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-659@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Kenta Yoshimura (Tokyo Institute of Technology)\nIn the inner crust of neutron stars\, a Coulomb lattice of nuclei exists\, im mersed in a sea of superfluid neutron gas. The interplay between these nuc lear crystals and the background neutrons may significantly alter nuclear dynamics\, a phenomenon known as the "entrainment" effect\, which is cruci al for understanding several astronomical phenomena.\n\nIn our study\, we have developed new self-consistent calculations that fully account for bot h superfluid effects and band structure effects. We have extracted the "ef fective mass" of free neutrons through the real-time method.\n\nIn this pr esentation\, we will show the formalism and methodology of our calculation s\, as well as further extensions towards comprehensive simulations of the subnuclear properties of neutron star matter.\n\nhttps://project.ccs.tsuk uba.ac.jp/event/23/contributions/659/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/659/ END:VEVENT BEGIN:VEVENT SUMMARY:Double beta decay phase space factor calculation using Coulomb pot ential calculated by mean field calculation DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-658@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Atsuya Kanai (University of Tsukuba)\nAbstract (PDF) \n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/658/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/658/ END:VEVENT BEGIN:VEVENT SUMMARY:Shape fluctuation in low-lying states in $N \\approx 40$ neutron-r ich nuclei DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-656@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Kouhei Washiyama (University of Tsukuba)\nAbstract ( PDF)\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/656/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/656/ END:VEVENT BEGIN:VEVENT SUMMARY:Accurate relativistic exchange energy functional for atomic nuclei DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-655@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: QIANG ZHAO (Research Center for Nuclear Physics\, Os aka University)\nThe shell evolution towards the extreme neutron-to-proton ratio has been a pivotal focus in nuclear physics over recent decades\, s ince it is crucial to understand the effective nucleon-nucleon interaction s and the r-process. Significant efforts have been devoted to deciphering the mechanism behind the shell evolution\, such as the spin-orbit interact ion\, the tensor force\, and the pseudospin symmetry. This motivates us to include the exchange energy in the relativistic density functional theory to simultaneously consider the important mechanisms in a self-consistent way.\n\nThe inclusion of nucleonic exchange energy has been a long-standin g challenge for the relativistic density functional theory in nuclear phys ics. We propose an orbital-dependent relativistic Kohn-Sham density functi onal theory to incorporate the exchange energy with local Lorentz scalar a nd vector potentials. The relativistic optimized effective potential equat ions for the local exchange potentials are derived and solved efficiently. The obtained binding energies and charge radii for nuclei are benchmarked with the results given by the traditional relativistic Hartree-Fock appro ach\, which involves intractable nonlocal potentials. It demonstrates that the present framework is not only accurate but also efficient. An extensi on to three-dimensional coordinate space is also realized\, which would ha ve great potential for wide applications.\n\nhttps://project.ccs.tsukuba.a c.jp/event/23/contributions/655/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/655/ END:VEVENT BEGIN:VEVENT SUMMARY:Coulomb interaction-driven entanglement of electrons on helium DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-652@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Oskar Leinonen (University of Oslo)\nThe generation and evolution of entanglement in many-body systems is an active area of re search that spans multiple fields\, from quantum information science to th e simulation of quantum many-body systems encountered in condensed matter\ , subatomic physics\, and quantum chemistry. Motivated by recent experimen ts exploring quantum information processing systems with electrons trapped above the surface of cryogenic noble gas substrates\, this talk will pres ent an theoretical investigation of the generation of *motional* entanglem ent between two electrons via their unscreened Coulomb interaction. The mo del system consists of two electrons confined in separate electrostatic tr aps which establish microwave-frequency quantized states of their motion. We have computed the motional energy spectra of the electrons\, as well as their entanglement\, by diagonalizing the model Hamiltonian with respect to a single-particle Hartree product basis. The computational procedure ou tlined here can be employed for device design and guidance of experimental implementations. In particular\, the theoretical tools developed here can be used for fine tuning and optimization of control parameters in future experiments with electrons trapped above the surface of superfluid helium or solid neon. \n\nThe talk is based on the paper "Coulomb interaction-dri ven entanglement of electrons on helium" by Beysengulov\, Schøyen\, Bilek \, Flaten\, Leinonen\, et al. [1]\, which is currently under review. \n\n[ 1] https://arxiv.org/abs/2310.04927\n\nhttps://project.ccs.tsukuba.ac.jp/e vent/23/contributions/652/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/652/ END:VEVENT BEGIN:VEVENT SUMMARY:A Theoretical Study on Spin-Filter Effect in Layered Materials DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-613@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Jin Inoue (Kanazawa University)\nAbstract (PDF)\n\nh ttps://project.ccs.tsukuba.ac.jp/event/23/contributions/613/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/613/ END:VEVENT BEGIN:VEVENT SUMMARY:Variational method with an explicit energy functional for symmetri c nuclear matter taking into account the spin-orbit force DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-612@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Toshiya Osuka (Department of Physics and Applied Phy sics\, Waseda University)\nAbstract (PDF)\n\nhttps://project.ccs.tsukuba.a c.jp/event/23/contributions/612/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/612/ END:VEVENT BEGIN:VEVENT SUMMARY:The Hubbard- and van der Waals-corrections on the DFT calculations of epsilon-zeta transition pressure in solid oxygen DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-611@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: The Anh Le (Outsourcer\, Quemix Inc.\, 2-11-2 Nihonb ashi\, Chuo-ku\, Tokyo 103-0027)\nIn this study\, we consider the treatmen ts of short-range and long-range interactions in solid oxygen at the epsil on-zeta phase transition using the Hubbard U and van der Waals dispersion\ , respectively. We show that the London dispersion may correctly capture t he nonlocal interactions in solid oxygen instead of the Hartree-Fock excha nge [1]. The nonlocal effect is expected to be dominant at below 20 GPa. A correct treatment of the local and nonlocal interactions on an equal foot ing is\, thus\, important to study the solid oxygen. A comparison of a dir ect van der Waals correction vdW-D and nonlocal two-body correlation funct ionals vdW-DF with the nonlocal Hartree-Fock exchange in hybrid functional s [2] will be presented.\n\nReferences\n[1] Le The Anh\, Phys. Chem. Chem. Phys. 25\, 25654 (2023).\n[2] A. J. Ochoa-Calle\, Chem. Theory Comput. 11 \, 3 (2015).\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/6 11/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/611/ END:VEVENT BEGIN:VEVENT SUMMARY:The rotational mode caused by the pair condensation in nuclei DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-610@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Chisato Ruike (University of Tsukuba)\nAbstract (PDF )\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/610/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/610/ END:VEVENT BEGIN:VEVENT SUMMARY:Variational method with an explicit energy functional for neutron matter at finite temperature taking into account the spin-orbit force DTSTART;VALUE=DATE-TIME:20240924T083000Z DTEND;VALUE=DATE-TIME:20240924T103000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-609@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Kento Kitanaka (Department of Physics and Applied Ph ysics\, Waseda Univesity)\nAbstract (PDF)\n\nhttps://project.ccs.tsukuba.a c.jp/event/23/contributions/609/ LOCATION:Kasuga Area\, University of Tsukuba URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/609/ END:VEVENT BEGIN:VEVENT SUMMARY:Welcome by IAC chair DTSTART;VALUE=DATE-TIME:20240923T005500Z DTEND;VALUE=DATE-TIME:20240923T010000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-681@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Gerardo Ortiz (Indiana University and Institue for A dvanced Study\, Princeton)\nhttps://project.ccs.tsukuba.ac.jp/event/23/con tributions/681/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/681/ END:VEVENT BEGIN:VEVENT SUMMARY:Recent advances in understanding the sign problem in path integral Monte Carlo simulation of harmonic fermions DTSTART;VALUE=DATE-TIME:20240924T053000Z DTEND;VALUE=DATE-TIME:20240924T055500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-620@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: SIU CHIN (Texas A&M University)\nAbstract (PDF)\n\nh ttps://project.ccs.tsukuba.ac.jp/event/23/contributions/620/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/620/ END:VEVENT BEGIN:VEVENT SUMMARY:Spin-S Kitaev-Heisenberg model on the honeycomb lattice: A high-or der treatment of its phase diagram via the coupled cluster method DTSTART;VALUE=DATE-TIME:20240923T055500Z DTEND;VALUE=DATE-TIME:20240923T062000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-622@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Raymond BISHOP (University of Manchester\, UK)\nAbst ract (PDF)\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/622 / LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/622/ END:VEVENT BEGIN:VEVENT SUMMARY:Intertwined Orders and the Physics of High Temperature Superconduc tors DTSTART;VALUE=DATE-TIME:20240926T063500Z DTEND;VALUE=DATE-TIME:20240926T070500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-678@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Eduardo Fradkin (Department of Physics and Anthony J . Leggett Institute for Condensed Matter Theory)\nComplex phase diagrams a re generic feature of quantum materials that display high temperature supe rconductivity. In addition to d-wave superconductivity (or other unconvent ional states)\, these phase diagrams typically include various forms of ch arge-ordered phases\, including charge-density-waves and/or spin-density w aves\, and electronic nematic states. In most cases these phases have crit ical temperatures comparable in magnitude to that of the superconducting s tate\,and appear in a "pseudo-gap" regime. In these systems the high temp erature state is not a good metal with well-defined quasiparticles but a " strange metal". These states typically arise from doping a strongly correl ated Mott insulator. With my collaborators we have identified these behavi ors as a problem with "Intertwined Orders". A Pair-density wave is a type of superconducting state which embodies the physics of intertwined orders. In this lecture I will discus the phenomenology of intertwined orders and the quantum materials that are known to display these behaviors.\n\nhttps ://project.ccs.tsukuba.ac.jp/event/23/contributions/678/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/678/ END:VEVENT BEGIN:VEVENT SUMMARY:Diagrammatic Monte Carlo for the Hubbard model DTSTART;VALUE=DATE-TIME:20240926T074500Z DTEND;VALUE=DATE-TIME:20240926T081500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-677@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Riccardo Rossi (École Polytechnique Fédérale de L ausanne\, Switzerland)\nIn this talk I will describe our recent progress i n the development of Diagrammatic Monte Carlo techniques for the two-dimen sional Fermi-Hubbard model. I will describe how correlations can lead to q ualitative changes in the Fermi surface\, or to a selective destruction of quasiparticle excitations near the antinodes in the pseudogap regime.\n\n https://project.ccs.tsukuba.ac.jp/event/23/contributions/677/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/677/ END:VEVENT BEGIN:VEVENT SUMMARY:Laudatio Kuemmel DTSTART;VALUE=DATE-TIME:20240926T073500Z DTEND;VALUE=DATE-TIME:20240926T074500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-673@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Jordi Boronat (Universitat Politècnica de Catalunya )\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/673/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/673/ END:VEVENT BEGIN:VEVENT SUMMARY:Majorana fermions in condensed matter physics. Examples DTSTART;VALUE=DATE-TIME:20240926T070500Z DTEND;VALUE=DATE-TIME:20240926T073500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-672@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Alexei Tsvelik (Brookhaven National Laboratory)\nIn this lecture I will concentrate on Majorana fermions as collective excitat ions and consider two examples related to my own research. The first is th e 2-channel Kondo effect where Majorana zero mode emerges as a remnant of the overscreened impurity spin\, and the other is the solvable model of 3 D Kondo lattice where Majorana fermions of the spin liquid create bound st ates with conduction electrons giving rise to an exotic superconductivity. \n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/672/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/672/ END:VEVENT BEGIN:VEVENT SUMMARY:Laudatio Feenberg DTSTART;VALUE=DATE-TIME:20240926T062500Z DTEND;VALUE=DATE-TIME:20240926T063500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-670@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Gerardo Ortiz (Indiana University and Institue for A dvanced Study\, Princeton)\nhttps://project.ccs.tsukuba.ac.jp/event/23/con tributions/670/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/670/ END:VEVENT BEGIN:VEVENT SUMMARY:Welcome by Director of CCS DTSTART;VALUE=DATE-TIME:20240923T005000Z DTEND;VALUE=DATE-TIME:20240923T005500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-668@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Taisuke Boku (University of Tsukuba)\nhttps://projec t.ccs.tsukuba.ac.jp/event/23/contributions/668/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/668/ END:VEVENT BEGIN:VEVENT SUMMARY:Electron-phonon coupling effect on the vibrational relaxation of C O on Pd(111) DTSTART;VALUE=DATE-TIME:20240926T053000Z DTEND;VALUE=DATE-TIME:20240926T055500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-647@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Raúl Bombín Escudero (Université de Bordeaux)\nTh e internal stretch mode of polar molecules adsorbed on metallic surfaces h as emerged as an exceptional test-bed in which to probe many-body theories in current state-of-the-art time-revolved spectroscopy experiments. Here we study non-adiabatic effects on the internal stretch mode of CO adsorbed on the Pd(111) surface by means of first principles calculations [1\, 2]. The theoretical\ntreatment that we employ\, including electron-hole pair excitations and electron-mediated coupling between the vibrational modes [ 3\, 4]\, allows us to study the internal stretch mode under thermal and no n-thermal conditions. The latter permits to simulate the conditions that a femtosecond infrared pump pulse generates on the system and to predict th e transient red-shift and change in the linewidth\nthat are induced. The l aser-induced non-thermal electron and phonon distributions are described\, respectively\, by Fermi-Dirac and Bose-Einstein distributions defined by time-dependent electronic Te(t) and lattice Tl(t) temperatures are calcula ted with a two temperature model (TTM).\n\n\n[1] R. Bombín\, A. S. Muzas\ , D. Novko\, J. I. Juaristi and M. Alducin\, Anomalous transient blueshift in the internal stretch mode of CO/Pd(111)\, *Phys. Rev. B* **107**\, L12 1404 (2023)\n[2] R. Bombín\, A. S. Muzas\, D. Novko\, J. I. Juaristi\, M. Alducin\, Vibrational dynamics of CO on Pd(111) in and out of thermal equ ilibrium\, *Phys. Rev. B* **108**\, 045409 (2023)\n[3] D. Novko.\, M. Aldu cin and J. I. Juaristi\, J. I. Juaristi\, Electron-Mediated Phonon-Phonon Coupling Drives the Vibrational Relaxation of CO on Cu(100)\, *Phys. Rev. Lett*. **120**\, 156804 (2018).\n[4] D. Novko\, J. C. Tremblay\, M. Alduci n\, J. I. Juaristi\, Ultrafast Transient Dynamics of Adsorbates on Surface s Deciphered: The Case of CO on Cu(100)\, *Phys. Rev. Lett.* **122**\, 016 806 (2018).\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/64 7/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/647/ END:VEVENT BEGIN:VEVENT SUMMARY:Quasi-steady state descriptions for photo-doped Mott insulators DTSTART;VALUE=DATE-TIME:20240926T050000Z DTEND;VALUE=DATE-TIME:20240926T053000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-596@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Yuta Murakami (RIKEN\, CEMS)\nDoping charge carriers into Mott insulators provides a pathway to produce intriguing emergent ph enomena [1]. In equilibrium systems\, doping can be chemically controlled. On the other hand\, photo-doping\, where particles are excited across the Mott gap\, provides an alternative way. Compared to chemical-doping\, pho to-doping creates a wider variety of charge carriers\, which may lead to t he emergence of fascinating nonequilibrium states. In particular\, when th e gap is large\, the lifetime of photo-carriers is exponentially enhanced\ , leading to quasi-steady states after intraband cooling of photo-carriers .\n\nIn this talk\, we introduce two types of theoretical descriptions to systematically explore quasi-steady states of photo-doped Mott insulators [1]. The first approach is the so-called nonequilibrium steady state appro ach\, where we approximate a photo-doped state as a nonequilibrium steady state stabilized by external baths. The second approach is the quasi-equil ibrium approach\, where we treat a photo-doped state as an equilibrium sta te of an effective model using the generalized Gibbs ensemble. In the firs t part\, we explain the idea of these approaches and their relations\, pro viding the overview of relevant works. In the second part\, we discuss the concrete application of the quasi- equilibrium approach to the 1D extende d Hubbard model [2\,3]. Using numerical and analytical methods\, we show t he emergence of the so-called η-pairing phase and the string charge-densi ty- wave phase in the photo-doped Mott insulators. In particular\, we show that the wave function of photo-doped states in the large on-site interac tion limit can be exactly expressed as $|\\Psi\\rangle = |\\Psi_{\\rm char ge}\\rangle|\\Psi_{\\rm spin}\\rangle|\\Psi_{\\rm \\eta-spin}\\rangle$\, w hich indicates the separation of spin\, charge and η−spin degrees of fr eedoms. Here η−spin represents the type of the photo-carriers\, i.e. do ublons and holons. This state is analogous to the celebrated Ogata-Shiba s tate of the doped Hubbard model in equilibrium. The expression provides us useful insight into the origin and properties of the photo-doped states. Our results demonstrate that the emergent degrees of freedom activated by photo-doping can lead to intriguing quantum states absent in equilibrium.\ n\n[1] Y. Murakami\, D. Golež\, M. Eckstein\, P. Werner\, arXiv:2310.0520 1 (a review paper).\n[2] Y. Murakami\, S. Takayoshi\, T. Kaneko\, Z. Sun\, D. Golež\, A. J. Millis\, P. Werner\, Comm. Phys. 5\, 23 (2022).\n[3] Y. Murakami\, S. Takayoshi\, T. Kaneko\, A. Läuchli\, P. Werner\, Phys. Rev . Lett. 130\, 106501 (2023)\, Editors’ suggestion.\n\nhttps://project.cc s.tsukuba.ac.jp/event/23/contributions/596/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/596/ END:VEVENT BEGIN:VEVENT SUMMARY:The two body density matrix of a Tomonaga Luttinger liquid DTSTART;VALUE=DATE-TIME:20240927T005500Z DTEND;VALUE=DATE-TIME:20240927T012000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-648@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Adrian Del Maestro (University of Tennessee\, Knoxvi lle)\nThe *n*-body reduced density matrix (*n*-RDM) characterizes higher o rder correlations in an interacting many-body system. This quantity can be used to compute any *n*-body observable without direct access to the full wavefunction\, and is experimentally measurable. The problem of computing higher order density matrices becomes increasingly challenging as the num ber of local operators grows. However\, within the Tomonaga Luttinger liqu id regime\, bosonization provides access to correlation functions by repre senting them as exponentials of bosonic field operators that are analytica lly tractable\, even in finite size systems. In this talk we present a de tailed analysis of the 2-RDM for an interacting one dimensional fermionic system including both diagonal matrix elements (corresponding to density-d ensity correlations) as well as off-diagonal components which demonstrate how coherences are affected by the interplay of interactions and indisting uishability. As an application we analyze density matrix renormalization g roup results for the *J*-*V* model of interacting\, spinless fermions in o ne dimension in the low-energy sector and use our 2-RDM to compute two-bod y observables.\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions /648/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/648/ END:VEVENT BEGIN:VEVENT SUMMARY:Vortices in a dipolar superfluid of interlayer excitons in bilayer semiconductors DTSTART;VALUE=DATE-TIME:20240927T003000Z DTEND;VALUE=DATE-TIME:20240927T005500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-629@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: David Neilson (University of Antwerp\, Antwerpen\, B elgium)\nAbstract (PDF)\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/cont ributions/629/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/629/ END:VEVENT BEGIN:VEVENT SUMMARY:Bose mixtures at finite temperature: magnetism and condensation p henomena DTSTART;VALUE=DATE-TIME:20240927T000000Z DTEND;VALUE=DATE-TIME:20240927T003000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-606@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Stefano Giorgini (BEC Center\, University of Trento and CNR-INO)\nI will review recent works on the study of both repulsive an d attractive Bose mixtures at finite temperature using exact path-integral quantum Monte-Carlo numerical methods. Repulsive mixtures in the quantum degenerate regime undergo a first-order ferromagnetic transition as a func tion of the interspecies coupling constant. The magnetic behavior close to the point of phase separation is found to contradict predictions based on mean-field and perturbative theories. Attractive mixtures are investigate d focusing on the regime of interspecies interactions where the ground sta te is in a self-bound liquid phase\, stabilized by beyond mean-field effec ts. Calculations of the isothermal curves in the pressure vs density pla ne are reported for different values of the attraction strength and the ex tent of the coexistence region between liquid and vapor is established. A similar behavior is observed both in 3D and 2D geometries. In particular\, the transition to the superfluid state occurs in a discontinuous way as t he density jumps from the gas to the liquid phase. Furthermore\, in 3D\, t he line of first-order transition terminates at a tricritical point and in 2D a relevant role in the gas-liquid transition is played by the quantum scale anomaly. The experimental relevance of these findings is also discus sed.\nReferences:\n1) Phase separation in binary Bose mixtures at finite t emperature\, G. Spada\, L. Parisi\, G. Pascual\, N. G. Parker\, T. P. Bill am\, S. Pilati\, J. Boronat and S. Giorgini\, SciPost Phys. 15\, 171 (2023 ). \n2) Attractive solution of binary Bose mixtures: liquid-vapour coexist ence and critical point\, G. Spada\, S. Pilati and S. Giorgini\, Phys. Rev . Lett. 131\, 173404 (2023).\n3) Quantum droplets in two-dimensional Bose mixtures at finite temperature\, G. Spada\, S. Pilati and S. Giorgini\, pr eprint\, arXiv:2405.09368.\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/c ontributions/606/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/606/ END:VEVENT BEGIN:VEVENT SUMMARY:A novel method for extracting and emulating continuum physics of f inite quantum systems DTSTART;VALUE=DATE-TIME:20240927T024500Z DTEND;VALUE=DATE-TIME:20240927T031000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-617@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Xilin Zhang (Facility for Rare Isotope Beams\, Michi gan State University)\nThe so-called reduced basis method from the field o f model order reduction is being actively adapted in studying nuclear many -body bound states. It provides fast and accurate interpolations (or emula tions) of the expensive many-body calculations in the input parameter spac e. These emulators are efficient interfaces through which users can effort lessly access these calculations. \n\nIn this talk\, I will discuss my rec ent studies on generalizing the method to deal with the continuum problems in finite quantum systems (e.g.\, nuclei or molecules). Two approaches ha ve been developed. The so-called real-energy emulation of the continuum ca lculations is viable for few-body systems. The other\, called complex-ener gy emulation\, works in the energy complex plane. The latter method could be used to extract many-body continuum physics (including scattering\, res ponse\, and resonances) from bound-state-like calculations. Moreover\, it can emulate these extractions in the model input parameter space (e.g.\, H amiltonian parameters). I will also briefly mention intriguing connections between the complex-energy emulation and recent progress in studying opti mal rational approximation as a numerical analytical continuation method.\ n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/617/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/617/ END:VEVENT BEGIN:VEVENT SUMMARY:An application of the shift-invert Lanczos method to the non-equil ibrium Green's function method DTSTART;VALUE=DATE-TIME:20240927T022000Z DTEND;VALUE=DATE-TIME:20240927T024500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-616@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Kotaro Uzawa (Kyoto University)\nDescribing transpor t properties of a many-body fermionic system is one of the most important topics in many fields of physics and chemistry. \nTo simulate the electron ic properties of nanodevices\, the non-equilibrium Green function method ( NEGF) has been widely employed.\nHowever\, this method suffers from substa ntial numerical costs for a calculation of the Green function.\nTo overcom e this problem\, we propose a novel approach to significantly reduce the n umerical cost of the NEGF by utilizing the shift-invert Lanczos method\, w here eigenstates of a Hamiltonian in the middle of the spectrum are select ively calculated.\nWe apply this procedure to model Hamiltonians for induc ed-fission reactions and demonstrate its effectiveness.\nFor instance\, fo r a Hamiltonian with 66103 dimensions\, we find that this method reduces t he computation time by about a factor of 30 compared to a direct evaluatio n.\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/616/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/616/ END:VEVENT BEGIN:VEVENT SUMMARY:Variational Theory and Parquet Diagrams for Nuclear Systems: A Com prehensive Study of Neutron Matter DTSTART;VALUE=DATE-TIME:20240927T015000Z DTEND;VALUE=DATE-TIME:20240927T022000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-600@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Eckhard Krotscheck (University at Buffalo SUNY)\nAbs tract (PDF)\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/60 0/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/600/ END:VEVENT BEGIN:VEVENT SUMMARY:In Search of an Organizing Principle for Quantum Hall Systems DTSTART;VALUE=DATE-TIME:20240926T025500Z DTEND;VALUE=DATE-TIME:20240926T032000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-635@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Gerardo Ortiz (Indiana University and Institue for A dvanced Study\, Princeton)\nI will describe connections between ground sta tes of quantum Hall Hamiltonians with multiple-Landau-level orbitals\, who se excitations display either Abelian or non-Abelian braiding statistics\, and (non-holomorphic) symmetric polynomials. In the case of two-body int eractions\, these represent parton states. The emergent Entangled Pauli Pr inciple (EPP)\, which defines the “DNA” of the quantum Hall fluid stat e\, is behind the exact determination of the topological characteristics o f those vacua\, including charge and braiding statistics of excitations\, and effective edge theory descriptions. This DNA admits a tensor network s tructure of finite bond dimension that emerges via root level entanglement and encodes all universal properties of the fluid. I will also present re cent work connecting these findings to the so-called "strange metal"\, a c ompressible critical state of matter with a hyperdegenerate ground state s ubspace and no Landau quasiparticles.\n\nhttps://project.ccs.tsukuba.ac.jp /event/23/contributions/635/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/635/ END:VEVENT BEGIN:VEVENT SUMMARY:Chester supersolid in dipolar interlayer exciton condensates DTSTART;VALUE=DATE-TIME:20240926T020000Z DTEND;VALUE=DATE-TIME:20240926T023000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-601@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Sara Conti (University of Antwerp\, Antwerp\, Belgiu m)\nWe have predicted in an electron-hole bilayer semiconductor system usi ng a variational approach\, a transition from an exciton superfluid to an incompressible “Chester supersolid”\, which has occupancy of one on ea ch lattice site [1].\n\nBy solving the full Gross-Pitaevskii equation for this 2D system\, we carry out a complete investigation of the time-depende nt dynamic exciton supersolid. Here\, the interaction between the exciton s is purely repulsive and dipolar-like\, in marked contrast with ultracold dipolar gases\, where the stability is driven by an additional effective attractive interaction[2]. We extend the Gross-Pitaevskii formalism to in clude the strong two-particle correlations[3]\, and to exclude the self-in teraction energy which is absent for one-particle occupancy per supersolid site[4]. \n\nWe present solutions of the Gross-Pitaevskii equation for a range of accessible experimental parameters which are the electron-hole la yer separation and the exciton density. \n\nReferences\n[1]S. Conti\, A. P erali\, A. R. Hamilton\, M. V. Milošević\, F. M. Peeters\, and D. Neilso n\, Phys. Rev. Lett. 130\, 057001 (2023).\n[2] A. Alaña\, I. L. Egusquiza \, and M. Modugno\, Phys. Rev. A 108\, 033316 (2023).\n[3] G. E. Astrakhar chik\, J. Boronat\, I. L. Kurbakov\, and Yu. E. Lozovik\, Phys. Rev. Lett. 98\, 060405 (2007).\n[4] P. W. Anderson\, J. Low Temp. Phys. 169\, 124 –132 (2012).\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions /601/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/601/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum many-body scars in dual-unitary circuits DTSTART;VALUE=DATE-TIME:20240926T003000Z DTEND;VALUE=DATE-TIME:20240926T010000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-644@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Shane Dooley (Dublin Institute for Advanced Studies (DIAS))\nDual-unitary circuits are a class of quantum systems for which ex act calculations of various quantities are possible\, even when the system is chaotic. The array of known exact results paints a picture of dual-uni tary circuits as rapidly thermalising systems. However\, we present a meth od to construct dual-unitary circuits for which some simple initial states fail to thermalise\, despite the circuits being "maximally chaotic"\, erg odic and mixing. This is achieved by embedding quantum many-body scars in the circuit. We support our analytic results with numerical simulations sh owing the stark contrast in the rate of entanglement growth from an initia l scar state compared to non-scar initial states. Our results are well sui ted to an experimental test\, due to the compatibility of the circuit layo ut with the native structure of current digital quantum simulators.\n\nhtt ps://project.ccs.tsukuba.ac.jp/event/23/contributions/644/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/644/ END:VEVENT BEGIN:VEVENT SUMMARY:Continuous-variable optimization: quantum vs classical DTSTART;VALUE=DATE-TIME:20240926T000000Z DTEND;VALUE=DATE-TIME:20240926T003000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-640@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Hidetoshi Nishimori (Tokyo Institute of Technology)\ nPerformance of quantum annealing for functions with continuous variables has not been well studied. We evaluate quantum annealing on a continuous-v ariable function with a rugged energy landscape\, using domain-wall encodi ng to map continuous to discrete variables. We assess several algorithms a nd hardware\, including D-Wave 2000Q\, TEBD\, simulated annealing\, and si mulated quantum annealing. TEBD's coherent quantum annealing significantly outperforms the others\, demonstrating effective coherent tunneling. Thes e results suggest that with reduced thermal noise in the hardware\, quantu m annealing hardware will surpass classical algorithms.\n\nhttps://project .ccs.tsukuba.ac.jp/event/23/contributions/640/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/640/ END:VEVENT BEGIN:VEVENT SUMMARY:Overcoming Fermionic Sign Problem in Lattice Quantum Monte Carlo: A Cuprate Case DTSTART;VALUE=DATE-TIME:20240925T025500Z DTEND;VALUE=DATE-TIME:20240925T032000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-621@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Alexander Lichtenstein (University of Hamburg)\nWe d eveloped a strong coupling perturbation scheme for general Hubbard model a round half-field particle-hole symmetric reference system [1]. The approac h based on a lattice determinatal Quantum Monte Carlo method in continuous and discrete time versions [2] for a large periodic clusters in a fermion ic bath. The first and second order perturbation in the shift of chemical potential and long-range hopping gives a reasonable accuracy for parameter s corresponding to the optimal cuprate systems. We calculate spectral func tion of doped t-t'-U model for interaction strength equal to the band wi dth and discuss a mechanism of the pseudogap formation. Results for standa rd cuprates model with U=8t=W and t'/t=-0.3 for the temperature of the ord er of T=0.1t show formation of the Fermi-arcs. We discuss the magnetic and superconducting instability using symmetry broken external fields.\n\n[1] S. Iskakov\, M. I. Katsnelson\, A. I. Lichtenstein\, npj Comp. Materials 10\, 36 (2024).\n[2] E. Gull\, A. J. Millis\, A. I. Lichtenstein\, et. al. \, Rev. Mod. Phys. 83\, 349 (2011).\n\nhttps://project.ccs.tsukuba.ac.jp/e vent/23/contributions/621/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/621/ END:VEVENT BEGIN:VEVENT SUMMARY:Tensor network toward the lattice QCD DTSTART;VALUE=DATE-TIME:20240925T022500Z DTEND;VALUE=DATE-TIME:20240925T025500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-604@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Shinichiro Akiyama (University of Tsukuba)\nTensor n etworks provide a new approach to studying quantum many-body problems. In particle physics\, tensor networks are attracting attention as a novel num erical method\, particularly for lattice theories with the sign problem. I n this talk\, recent progress in tensor networks for particle physics\, to ward their future applications to the lattice QCD\, will be discussed.\n\n https://project.ccs.tsukuba.ac.jp/event/23/contributions/604/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/604/ END:VEVENT BEGIN:VEVENT SUMMARY:Tensor networks and new classical heuristics DTSTART;VALUE=DATE-TIME:20240925T015500Z DTEND;VALUE=DATE-TIME:20240925T022500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-654@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Garnet Kin-Lic Chan (California Institute of Technol ogy)\nI will discuss \n(i) some recent progress to improve the expressivit y of tensor networks\n(ii) the rate of convergence of tensor network calcu lations and the error dependence of this classical heuristics\n(iii) some new classical algorithms for many-body systems motivated by noisy quantum simulation.\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/65 4/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/654/ END:VEVENT BEGIN:VEVENT SUMMARY:New Analytical Representation for Electronic Terms of Nuclear Schi ff Moment DTSTART;VALUE=DATE-TIME:20240925T005000Z DTEND;VALUE=DATE-TIME:20240925T012000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-642@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Minori Abe (Hiroshima University)\nThe nuclear Schif f moment (NSM) is produced by a nuclear force that simultaneously violates charge conjugation (C) symmetry and spatial parity (P) inversion symmetry . The experimental detection of NSM is significant as CP violation is cruc ial for explaining the current matter-dominated universe. Measuring NSM in molecules necessitates precise experiments and theoretical calculations t hat incorporate both electronic and nuclear wavefunctions. Conventionally\ , electronic terms have been approximated using a first-order power series expansion of the electronic radial function\; however\, this may not be s ufficiently accurate. In this study\, we introduce a new accurate analytic al expression for the electronic terms using Gaussian basis sets\, which a voids any truncation of the power series. For the RaO molecule\, a prime c andidate for NSM observation\, conventional methods overestimated the elec tronic terms by more than 50%\, underscoring the significance of our analy tical approach.\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contribution s/642/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/642/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum computations of relativistic and many-body effects in atom ic and molecular systems based on variational algorithms DTSTART;VALUE=DATE-TIME:20240925T002000Z DTEND;VALUE=DATE-TIME:20240925T005000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-639@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Bhanu Das (TCG CREST)\nQuantum computations of relat ivistic and many-body effects in atomic and molecular systems based on var iational algorithms\n\n Bhanu Pratap Das\n Centre for Quantum Engineering Research and Education\n TCG Centres for Research and Education in Science and Technology\n Kolkata\, India\n\n Department of Physics\, School of Science \n Tok yo Institute of Technology\n Tokyo\, Japan\n\n\nIn this talk\, I shall present results of our recent computations of relativistic and ma ny-body effects in atomic and molecular systems on digital quantum compute rs and also the D-wave quantum annealer. The variational quantum eigensolv er (VQE) was used to compute the hyperfine interaction constants for atomi c systems and the dipole moments of molecular systems on superconducting a nd trapped ion platforms respectively. The ground-state energies were obta ined as a byproduct of the calculations for both the cases and were determ ined to within one per cent of the classical computations. The correspondi ng errors for the hyperfine interaction constants and the molecular dipole moments were found to be larger. The interplay of relativistic and many-b ody effects for all the properties will be discussed.\n\nFinally\, the res ults for the fine-structure intervals in boron-like ions using the quantum annealer eigensolver (QAE) will be presented. This quantity is relativist ic in origin\, but is influenced by many-body effects. We have computed it to an accuracy of 99% on the D-wave annealer compared to high precision l aboratory measurements. The reasons for achieving this high accuracy will be explained.\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/ 639/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/639/ END:VEVENT BEGIN:VEVENT SUMMARY:Self-consistent single-nucleon potential describing nuclear struct ure to intermediate-energy scattering DTSTART;VALUE=DATE-TIME:20240924T074500Z DTEND;VALUE=DATE-TIME:20240924T081000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-623@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Hitoshi Nakada (Chiba University)\nAbstract (PDF)\n\ nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/623/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/623/ END:VEVENT BEGIN:VEVENT SUMMARY:BCS-BEC crossover in nuclear matter and related systems DTSTART;VALUE=DATE-TIME:20240924T072000Z DTEND;VALUE=DATE-TIME:20240924T074500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-624@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Armen Sedrakian (FIAS and Uni. of Wroclaw)\nI will d iscuss the features of BCS-BEC crossover in nuclear systems and by extensi on also in fermionic ultra-cold gases in the presence of population imbala nce. The phase diagram of such systems will be discussed including phases with broken space symmetries and phase separation. It will be pointed out that several tri-critical points appear on the phase diagram of such a sys tem.\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/624/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/624/ END:VEVENT BEGIN:VEVENT SUMMARY:Recent advances in ab initio calculations of heavy nuclei DTSTART;VALUE=DATE-TIME:20240924T065000Z DTEND;VALUE=DATE-TIME:20240924T072000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-599@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Takayuki Miyagi (University of Tsukuba)\nOne of the fundamental problems in nuclear physics is to predict the properties of nu clei based on underlying nuclear interactions. The applicability of nuclea r ab initio calculation has been expanding in the past few decades\, and s ystematic calculations can be performed up to mass number $\\sim$ 100. How ever\, the applications for heavier systems are limited primarily due to t he memory-expensive three-nucleon (3N) interaction matrix elements. Modern nuclear ab initio calculations begin with the nucleon-nucleon (NN) and 3N interactions\, benefitting from chiral effective field theory. For medium - and heavy-mass nuclei\, one can apply basis expansion methods such as th e coupled-cluster method\, self-consistent Green's function method\, many- body perturbation theory\, and in-medium similarity renormalization group\ , starting from the NN and 3N matrix elements expressed with the spherical harmonic-oscillator (HO) basis set\, where a typical calculation is perfo rmed within 13 or 15 major-shell space. The memory requirement of the 3N m atrix elements in such space will exceed 10 TB\, and one needs another tru ncation for 3N matrix elements\, known as $E_{\\rm 3max}$ defined by the s um of 3N HO quanta. It turned out that the current $E_{\\rm 3max}$ limit d oes not allow us to obtain converged results for nuclei heavier than $A~\\ sim$ 100. To overcome the limitation\, we proposed a new storage scheme f or the 3N matrix elements\, where we exploit the feature of the normal-ord ered two-body approximation widely used in the basis expansion methods. Th is new scheme enables us to compute the known heaviest doubly magic nucleu s $^{208}$Pb. In this presentation\, I will show recent ab initio results for some heavy mass nuclei\, including a prediction for the neutron-skin t hickness of $^{208}$Pb.\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/cont ributions/599/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/599/ END:VEVENT BEGIN:VEVENT SUMMARY:Decoherence of a qubit interacting with a complex spin bath DTSTART;VALUE=DATE-TIME:20240924T055500Z DTEND;VALUE=DATE-TIME:20240924T062000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-637@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Nanako Shitara (Department of Physics\, University o f Colorado Boulder\, Colorado 80309\, USA)\nAbstract (PDF)\n\nhttps://proj ect.ccs.tsukuba.ac.jp/event/23/contributions/637/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/637/ END:VEVENT BEGIN:VEVENT SUMMARY:Pseudomodes: from solving the spin-boson model to finding ground s tates DTSTART;VALUE=DATE-TIME:20240924T050000Z DTEND;VALUE=DATE-TIME:20240924T053000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-602@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Neill Lambert (RIKEN)\nPseudomodes have grown in pop ularity in recent years as an intuitive numerical method for solving the g eneral problem of a quantum system coupled to a Gaussian environment. I wi ll summarize the various formulations of pseudomodes that have appeared in the literature\, and demonstrate how they can be used to model non-Markov ian bosonic environments and the Kondo effect in the single-impurity Ander son model. I will finish with showing how they can be used an convenient p rotocol for performing quantum simulation of open quantum systems and\, co nsequently\, for acting as engineered environments for dissipative state e ngineering.\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/60 2/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/602/ END:VEVENT BEGIN:VEVENT SUMMARY:Theoretical Modeling of Ultrafast Phase Transitions from the Femto second to the Picosecond Scale DTSTART;VALUE=DATE-TIME:20240924T015500Z DTEND;VALUE=DATE-TIME:20240924T022500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-646@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Matteo Calandra (University of Trento)\nIn this talk \, I will introduce a theoretical approach to ultrafast phase transitions able to capture both the electron and phonon dynamics after laser pumping on a time scale ranging from a few femtoseconds to several picoseconds aft er laser irradiation.\n\nAt short times\, the method relies on the solutio n of the Bloch equations coupled to the Ehrenfest dynamics. It includes th e electric field of the pump as well as the electron-phonon\, electron-ele ctron\, and phonon-phonon scattering completely from first principles.\n\n At longer times before recombination\, when the electron-electron interact ion generates a photoexcited quasi-equilibrium electron-hole plasma\, the approach is based on a constrained density functional perturbation theory (cDFPT) scheme accounting both for the presence of holes in the valence ba nd and electrons in the conduction band (two Fermi levels approach). In th is framework\, calculation of forces\, phonon dispersion\, and electron-ph onon coupling are possible\, as well as molecular dynamics with machine le arning potential in the presence of an electron-hole plasma.\n\nI will sho wcase the application of the method to several materials ranging from low- dimensional dichalcogenides to ferroelectrics and thermoelectrics.\n\nThis work is funded by the European Union (ERC\, DELIGHT\, 101052708)\n\nhttps ://project.ccs.tsukuba.ac.jp/event/23/contributions/646/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/646/ END:VEVENT BEGIN:VEVENT SUMMARY:A Comparison of Methods for Simulating Quantum Dot Dynamics DTSTART;VALUE=DATE-TIME:20240924T010000Z DTEND;VALUE=DATE-TIME:20240924T012500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-634@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Jonas Flaten (University of Oslo)\nWithin the field of computational quantum many-body dynamics\, several approaches exist to approximating and simulating the time evolution of quantum systems with mu ltiple particles. In this presentation\, four numerical methods will be co mpared: the time-dependent configuration-interaction (TDCI) method\, the m ulti-configurational time-dependent Hartree-Fock (MCTDHF) method\, the tim e-dependent coupled-cluster (TDCC) method and time-dependent density funct ional theory (TDDFT). Strengths and weaknesses of these methods will be di scussed\, as well as possibly beneficial ways to combine them\, with respe ct to simulation of spatially confined systems relevant to quantum chemist ry\, nuclear physics and quantum computing.\n\nThe TDCI\, MCTDHF and TDCC methods all rely on a basis of single-particle states which has large impa ct on the size of the computations involved. The choice of a good basis is therefore also of relevance when discussing these methods\, and in this p resentation an overview of some alternatives with analytic\, geometric or physical benefits will be discussed\, as well as the possibility of using DFT to find a good one-body basis which sufficiently spans the many-body d ynamics of a given system.\n\nThe presentation is partly based on an upcom ing paper by Morten Hjorth-Jensen\, Oskar Leinonen\, Jonas B. Flaten and o thers from the University of Oslo\, discussing technical aspects of and co mparing various methods for simulating quantum dot systems\, with simulati ons of several particles in a 3D harmonic oscillator as an example.\n\nhtt ps://project.ccs.tsukuba.ac.jp/event/23/contributions/634/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/634/ END:VEVENT BEGIN:VEVENT SUMMARY:Surrogate models for quantum many-body systems DTSTART;VALUE=DATE-TIME:20240924T003000Z DTEND;VALUE=DATE-TIME:20240924T010000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-643@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Sota Yoshida (Utsunomiya University)\nQuantum many-b ody systems\, particularly in nuclear physics\, present significant comput ational challenges due to their complex interactions and high-dimensional state spaces. Surrogate models offer a promising solution by providing sim plified yet accurate representations of these systems\, reducing computati onal costs and enhancing scalability.\n\nThis talk will focus on the devel opment and application of surrogate models specifically for nuclear many-b ody problems. We will explore various approaches\, including machine learn ing techniques and reduced basis method.\n\nhttps://project.ccs.tsukuba.ac .jp/event/23/contributions/643/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/643/ END:VEVENT BEGIN:VEVENT SUMMARY:How to describe all nuclei at polynomial cost in the ab initio fra mework DTSTART;VALUE=DATE-TIME:20240924T000000Z DTEND;VALUE=DATE-TIME:20240924T003000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-641@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Vittorio Somà (CEA Saclay)\nA strong effort will be dedicated in the coming years to extend the reach of ab initio nuclear-st ructure calculations to heavy doubly open-shell nuclei. In order to do so\ , the most efficient strategies to incorporate dominant many-body correlat ions at play in such nuclei must be identified. With this motivation in mi nd\, the present work pedagogically analyses the inclusion of many-body co rrelations and their impact on binding energies of Calcium and Chromium is otopes. Employing an empirically-optimal Hamiltonian built from chiral eff ective field theory\, binding energies along both isotopic chains are stud ied via a hierarchy of approximations based on polynomially-scaling expans ion many-body methods. The spherical mean-field approximation is shown to display specific shortcomings in Ca isotopes that are efficiently correcte d via the consistent addition of low-order dynamical correlations on top o f it. While the same setting cannot appropriately reproduce binding energi es in doubly open-shell Cr isotopes\, allowing the unperturbed mean-field state to break rotational symmetry permits to efficiently capture the stat ic correlations responsible for the phenomenological differences observed between the two isotopic chains. Eventually\, the present work demonstrate s in a pedagogical way that polynomially-scaling expansion methods based o n unperturbed states that possibly break (and restore) symmetries constitu te an optimal route to extend ab initio calculations to heavy closed- and open-shell nuclei.\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contribut ions/641/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/641/ END:VEVENT BEGIN:VEVENT SUMMARY:Boson-fermion pairing in resonant Bose-Fermi mixtures DTSTART;VALUE=DATE-TIME:20240923T075000Z DTEND;VALUE=DATE-TIME:20240923T081500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-636@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Pierbiagio Pieri (University of Bologna & Istituto N azionale di Fisica Nucleare)\nAbstract (PDF)\n\nhttps://project.ccs.tsukub a.ac.jp/event/23/contributions/636/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/636/ END:VEVENT BEGIN:VEVENT SUMMARY:From ground state energies towards excitations for extended quantu m systems DTSTART;VALUE=DATE-TIME:20240923T072000Z DTEND;VALUE=DATE-TIME:20240923T075000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-645@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Markus Holzmann (LPMMC\, CNRS & UGA Grenoble)\nItera ted backflow and neural network wave functions indicate a systematic way to improve the accuracy of quantum Monte Carlo (QMC) calculations of groun d state energies of large (but finite) quantum systems in two or three spa tial dimensions at zero temperature. I will illustrate recent improvements on the calculations of the ground state phase diagram of the electron gas and of the phase transition from liquid to solid helium. Then I will disc uss the difficulties one faces when extending QMC calculations to study ex citation properties of bulk materials\, e.g. electronic band gaps in solid hydrogen and the effective mass of the electron gas.\n\nhttps://project.c cs.tsukuba.ac.jp/event/23/contributions/645/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/645/ END:VEVENT BEGIN:VEVENT SUMMARY:Neural-network quantum states for ultra-cold Fermi gases DTSTART;VALUE=DATE-TIME:20240923T065000Z DTEND;VALUE=DATE-TIME:20240923T072000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-598@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Jane Kim (Ohio University)\nUltra-cold Fermi gases e xhibit a rich array of quantum mechanical properties\, including the trans ition from a fermionic superfluid Bardeen-Cooper-Schrieffer (BCS) state to a bosonic superfluid Bose-Einstein condensate (BEC). While these properti es can be precisely probed experimentally\, accurately describing them pos es significant theoretical challenges due to strong pairing correlations a nd the non-perturbative nature of particle interactions. In this talk\, I will introduce our recent development­­—a Pfaffian-Jastrow neural-netw ork quantum state featuring a message-passing architecture\, designed to e fficiently capture pairing and backflow correlations. We benchmark our app roach on existing Slater-Jastrow frameworks and state-of-the-art diffusion Monte Carlo methods\, demonstrating a performance advantage and the scala bility of our scheme. We show that transfer learning stabilizes the traini ng process in the presence of strong\, short-ranged interactions\, and all ows for an effective exploration of the BCS-BEC crossover region. Our find ings highlight the potential of neural-network quantum states as a promisi ng strategy for investigating ultra-cold Fermi gases. Finally\, I will dis cuss initial results applying this ansatz to nuclear matter and nuclei.\n\ nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/598/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/598/ END:VEVENT BEGIN:VEVENT SUMMARY:Exact Field Induced Ground States of the Quantum Compass Model DTSTART;VALUE=DATE-TIME:20240923T053000Z DTEND;VALUE=DATE-TIME:20240923T055500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-631@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Erik Sorensen (McMaster University)\nWe consider the square lattice S=½ quantum compass model (QCM) parameterized by\nJx\, Jz \, under an in-plane field. At the special field value\, (hx*\,hz*)=2S(Jx\ ,Jz)\, we show that the QCM Hamiltonian may be written in a form such that two simple product states can be identified as exact ground-states\, belo w a gap. Exact excited states can also be found. The exact product states are characterized by a staggered vector chirality\, attaining a non-zero v alue in the surrounding phase\, and can also be realized in 1D spin chains . The resulting gapped phase occupies most of the in-plane field phase dia gram\, but is clearly distinct from the high field polarized phase. Using iDMRG and iPEPS techniques in combination with exact diagonalizations and analytical arguments\, we determine the complete in-plane field phase diag ram [1]. Our findings are important for understanding the field dependent phase diagram of materials with predominantly directionally-dependent Isin g interactions\, and duality relations connects the QCM model to the Xu-Mo ore model and the toric code.\n\nhttps://project.ccs.tsukuba.ac.jp/event/2 3/contributions/631/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/631/ END:VEVENT BEGIN:VEVENT SUMMARY:Approximating Many-Electron Wave Functions using Neural Networks DTSTART;VALUE=DATE-TIME:20240923T050000Z DTEND;VALUE=DATE-TIME:20240923T053000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-595@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Matthew Foulkes (Imperial College London)\nExact wav e functions of molecules and solid-state simulation cells containing more than a few electrons are out of reach because they are NP-hard to compute in general\, but approximations can be found using polynomially scaling al gorithms. A key challenge in many such approaches is the choice of an appr oximate parameterized wave function\, which must trade accuracy for effici ency. Neural networks have shown impressive power as practical function ap proximators and promise as a way of representing wave functions for spin s ystems\, but electronic wave functions have to obey Fermi-Dirac statistics . This talk describes a deep learning architecture\, the Fermionic neural network\, which is capable of approximating many-electron wave functions a nd greatly outperforms conventional approximations. Applications to a rang e of problems in molecular chemistry and solid-state physics will be discu ssed.\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/595/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/595/ END:VEVENT BEGIN:VEVENT SUMMARY:Simple many-body dynamics is a powerful quantum reservoir DTSTART;VALUE=DATE-TIME:20240923T030000Z DTEND;VALUE=DATE-TIME:20240923T032500Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-632@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Akitada Sakurai (OIST)\nMany body quantum systems in ternally have exponentially huge Hilbert spaces and complex dynamics. Much research has been done to find ways to exploit this complexity for practi cal applications and information processing. Quantum reservoir computing h as garnered attention as an approach to directly utilize the complexity of quantum dynamics as a computational resource[1\,2]. It is considered for potential applications with Noise-Intermediate Scale Quantum (NISQ) device s. Several studies have reported that complex dynamics possess enough comp lexity to serve as effective reservoirs. On the contrary\, can simple quan tum systems be used as reservoirs? For example\, can quantum systems\, whi ch classical computers can efficiently simulate\, work well as reservoirs? This talk will discuss how simple a system can be used as a quantum reser voir and where it cannot be. Furthermore\, we discuss the boundary between potent and poor reservoirs[3]. \n[1] Fujii\, Keisuke\, et al. "Harnessing disordered-ensemble quantum dynamics for machine learning." Phys. Rev. Ap plied 8 024030 (2017).\n[2] A. Sakurai et al.\, “Quantum Extreme Reservo ir Computation Utilizing Scale-Free Networks\,” Phys. Rev. Applied 17\, 064044 (2022). \n[3] Sakurai\, Akitada\, et al. "Simple Hamiltonian dynami cs is a powerful quantum processing resource." arXiv preprint arXiv:2405.1 4245 (2024).\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/6 32/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/632/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum Computing for Nuclear Physics DTSTART;VALUE=DATE-TIME:20240923T023000Z DTEND;VALUE=DATE-TIME:20240923T030000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-597@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Alessandro Roggero (University of Trento\, TIFPA)\nW ith the recent experimental realization of quantum computing devices conta ining tens to hundreds of qubits and fully controllable operations\, the t heoretical effort in designing efficient quantum algorithms for a variety of problems has seen a tremendous growth worldwide. In this talk I will di scuss the potential impact of quantum computing for application in nuclear physics and present some recent results of quantum simulations for simple nuclear models on current generation devices.\n\nhttps://project.ccs.tsuk uba.ac.jp/event/23/contributions/597/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/597/ END:VEVENT BEGIN:VEVENT SUMMARY:A fully-programmable universal quantum simulator using Floquet tec hnology DTSTART;VALUE=DATE-TIME:20240923T013000Z DTEND;VALUE=DATE-TIME:20240923T020000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-605@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Kae Nemoto (Okinawa Institute of Science and Technol ogy)\nWith the size of quantum information processors increasing\, quantum simulation has become one of its promising near-future applications. Now it is known that when the computational problem at hand is difficult\, th e difficulty often appears in terms of an increased quantum circuit depth in gate based implementations or as many-body interaction terms in Hamilto nian based computation. In particular\, many-body interactions are diffic ult to directly implement. To circumvent such difficulties\, we introduce a reverse engineering based Floquet technology to turn one-dimentional no n-universal superconducting qubit arrays Into a full-programmable universa l quantum simulator. A time dependent Hamitonian can give a unitary map e quivalent of the time-evoluation of a non-trivial Hamiltonian different fr om the original physical Hamiltonian. Using this Floquet nature\, we can tune the evolution time of this physical resource to create an arbitrary H amiltonian. This creates a tradeoff between the time necessary for the si mulation and the simplicity of its hardware implementation. We discuss th e advantages and disadvantages of the universal quantum simulator as a mod el to investigate complex quantum dynamics as well as for experimental imp lementation.\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contributions/6 05/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/605/ END:VEVENT BEGIN:VEVENT SUMMARY:Simulating dissipative quantum many-body dynamics via the time-dep endent Variational Monte Carlo method DTSTART;VALUE=DATE-TIME:20240923T010000Z DTEND;VALUE=DATE-TIME:20240923T013000Z DTSTAMP;VALUE=DATE-TIME:20260910T133520Z UID:indico-contribution-23-603@project.ccs.tsukuba.ac.jp DESCRIPTION:Speakers: Davide Emilio Galli (Dipartimento di Fisica\, Univer sità degli Studi di Milano)\nThe rapid advancement in quantum technologie s has heightened interest in surpassing classical simulators through quant um supremacy. A significant challenge in this endeavor is the effective un derstanding and manipulation of open quantum systems\, which are crucial f or the progression of advanced quantum technologies. While several approxi mate methods have been proposed to simulate the dynamics of open quantum s ystems\, their applicability has largely been confined to small-scale syst ems [1].\nIn this study\, we introduce a novel approach utilizing the time -dependent Variational Monte Carlo (tVMC) method. Our method employs the u nravelling of master equations to produce a series of quantum trajectories governed by a stochastic Schrödinger equation (SSE). When the effect of the environment can be well approximated by a Markovian master equation\, by solving multiple independent trajectories we reconstruct time-dependent observables consistently.\nWe apply this method to dissipative quantum ma ny-body models\, exploring various variational ansätze\, ranging from Jas trow wavefunctions to more advanced Neural Networks Quantum States (NNQS) [2\, 3].\n\nReferences\n [1] H. Weimer\, A. Kshetrimayum and R. Orús\, Re v. Mod. Phys. 93\, 015008 (2021).\n [2] G. Carleo and M. Troyer\, Science 355\, 602 (2017).\n [3] M. J. Hartmann and G. Carleo\, Phys. Rev. Lett. 12 2\, 250502 (2019).\n\nhttps://project.ccs.tsukuba.ac.jp/event/23/contribut ions/603/ LOCATION:Kasuga Campus\, University of Tsukuba Kasuga Auditorium URL:https://project.ccs.tsukuba.ac.jp/event/23/contributions/603/ END:VEVENT END:VCALENDAR