Speaker
Description
Quantum computations of relativistic and many-body effects in atomic and molecular systems based on variational algorithms
Bhanu Pratap Das
Centre for Quantum Engineering Research and Education
TCG Centres for Research and Education in Science and Technology
Kolkata, India
Department of Physics, School of Science
Tokyo Institute of Technology
Tokyo, Japan
In this talk, I shall present results of our recent computations of relativistic and many-body effects in atomic and molecular systems on digital quantum computers and also the D-wave quantum annealer. The variational quantum eigensolver (VQE) was used to compute the hyperfine interaction constants for atomic systems and the dipole moments of molecular systems on superconducting and trapped ion platforms respectively. The ground-state energies were obtained as a byproduct of the calculations for both the cases and were determined to within one per cent of the classical computations. The corresponding errors for the hyperfine interaction constants and the molecular dipole moments were found to be larger. The interplay of relativistic and many-body effects for all the properties will be discussed.
Finally, the results for the fine-structure intervals in boron-like ions using the quantum annealer eigensolver (QAE) will be presented. This quantity is relativistic 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 laboratory measurements. The reasons for achieving this high accuracy will be explained.
