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

• URL: http://arxiv.org/abs/2203.14756v1
• Date: Mon, 28 Mar 2022 13:46:50 GMT
• Title: Reference-State Error Mitigation: A Strategy for High Accuracy Quantum Computation of Chemistry
• Authors: Phalgun Lolur, M{\aa}rten Skogh, Christopher Warren, Janka Bizn\'arov\'a, Amr Osman, Giovanna Tancredi, G\"oran Wendin, Jonas Bylander and Martin Rahm
• Abstract summary: This work introduces a strategy for reference-state error mitigation (REM) of quantum chemistry. REM can be applied alongside existing mitigation procedures, while requiring minimal post-processing. The approach is agnostic to the underlying quantum mechanical ansatz and is designed for the variational quantum eigensolver (VQE)
• Score: 0.6501025489527174
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: 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 post-processing 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 (VQE). 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 argue for scalability of the method.

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