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Error Sensitivity to Environmental Noise in Quantum Circuits for Chemical State Preparation by Sawaya, Nicolas P. D.; Smelyanskiy, Mikhail; McClean, Jarrod R.; Aspuru-Guzik, Alán is a scholarly article available to read on EtoBox.

What is Error Sensitivity to Environmental Noise in Quantum Circuits for Chemical State Preparation about?

Calculating molecular energies is likely to be one of the first useful applications to achieve quantum supremacy, performing faster on a quantum than a classical computer. However, if future quantum devices are to produce accurate calculations, errors due to environmental noise and algorithmic approximations need to be characterized and reduced. In this study, we use the high performance qHiPSTER software to investigate the effects of environmental noise on the preparation of quantum chemistry states. We simulated eighteen 16-qubit quantum circuits under environmental noise, each corresponding to a unitary coupled cluster state preparation of a different molecule or molecular configuration. Additionally, we analyze the nature of simple gate errors in noise-free circuits of up to 40 qubits. We find that the Jordan-Wigner (JW) encoding produces consistently smaller errors under a noisy environment as compared to the Bravyi-Kitaev (BK) encoding. For the JW encoding, pure-dephasing noise is shown to produce substantially smaller errors than pure relaxation noise of the same magnitude. We report error trends in both molecular energy and electron particle number within a unitary coupled

Author

Sawaya, Nicolas P. D.; Smelyanskiy, Mikhail; McClean, Jarrod R.; Aspuru-Guzik, Alán

Published

2016

Language

EN