Reference-State Error Mitigation: A Strategy for High Accuracy Quantum Computation of Chemistry

Phalgun Lolur; Mårten Skogh; Werner Barucha-Dobrautz; Christopher Warren; Janka Biznárová; Amr Osman; Giovanna Tancredi; Göran Wendin; Jonas Bylander; Martin Rahm

doi:10.1021/acs.jctc.2c00807

Reference-State Error Mitigation: A Strategy for High Accuracy Quantum Computation of Chemistry
Journal article, 2023

Decoherence and gate errors severely limit the capabilities of state-of-the-art quantum computers. This work introduces a strategy for reference-state error mitigation (REM) of quantum chemistry that can be straightforwardly implemented on current and near-term devices. REM can be applied alongside existing mitigation procedures, while requiring minimal postprocessing and only one or no additional measurements. The approach is agnostic to the underlying quantum mechanical ansatz and is designed for the variational quantum eigensolver. Up to two orders-of-magnitude improvement in the computational accuracy of ground state energies of small molecules (H2, HeH+, and LiH) is demonstrated on superconducting quantum hardware. Simulations of noisy circuits with a depth exceeding 1000 two-qubit gates are used to demonstrate the scalability of the method.

Author

Phalgun Lolur

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry

Other publications Research

Mårten Skogh

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry

AstraZeneca AB

Other publications Research