Quantum simulation of bosons with the contracted quantum eigensolver

Wang, Yuchen; Sager-Smith, LeeAnn M.; Mazziotti, David A.

doi:10.1088/1367-2630/acf9c3

Title: Quantum simulation of bosons with the contracted quantum eigensolver

Journal Article · 04 October 2023 · New Journal of Physics

DOI: https://doi.org/10.1088/1367-2630/acf9c3 · OSTI ID:2007692

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Abstract Quantum computers are promising tools for simulating many-body quantum systems due to their potential scaling advantage over classical computers. While significant effort has been expended on many-fermion systems, here we simulate a model entangled many-boson system with the contracted quantum eigensolver (CQE). We generalize the CQE to many-boson systems by encoding the bosonic wavefunction on qubits. The CQE provides a compact ansatz for the bosonic wave function whose gradient is proportional to the residual of a contracted Schrödinger equation. We apply the CQE to a bosonic system, where N quantum harmonic oscillators are coupled through a pairwise quadratic repulsion. The model is relevant to the study of coupled vibrations in molecular systems on quantum devices. Results demonstrate the potential efficiency of the CQE in simulating bosonic processes such as molecular vibrations with good accuracy and convergence even in the presence of noise.

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019215

OSTI ID:: 2007692

Journal Information:: New Journal of Physics, Journal Name: New Journal of Physics Journal Issue: 10 Vol. 25; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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