We report the first results for the computation of relativistic effects in quantum many-body systems using quantum annealers. An average accuracy of 98.9% in the fine structure splitting of boron-like ions with respect to experiments has been achieved using the Quantum Annealer Eigensolver (QAE) algorithm on the D-Wave Advantage hardware. We obtain these results in the framework of the many-electron Dirac theory. We implement QAE through our quantum annealing workflow that includes a novel qubit encoding scheme and a perturbation theory-based decomposition strategy.
@article{arxiv.2212.01801,
title = {Accurate Computation of Relativistic Excitation Energies Using Quantum Annealing},
author = {Vikrant Kumar and Nishanth Baskaran and V. S. Prasannaa and K. Sugisaki and D. Mukherjee and K. G. Dyall and B. P. Das},
journal= {arXiv preprint arXiv:2212.01801},
year = {2023}
}