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arXiv 2203.14756quant-phphysics.comp-ph
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参考态误差抑制:高精度化学量子计算的一种策略

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

Phalgun Lolur, Mårten Skogh, Christopher Warren, Janka Biznárová, Amr Osman, Giovanna Tancredi, Göran Wendin, Jonas Bylander, Martin Rahm

摘要:

退相干和门错误严重限制了最先进的量子计算机的能力。这项工作介绍了一种量子化学的参考态误差缓解(REM)策略,可以直接在当前和近期的设备上实现。REM可以与现有的缓解程序一起应用,同时需要最少的后处理,仅需要一次或不需要额外的测量。该方法是不可知的潜在的量子力学的anomalies和变分量子本征求解器(VQE)的设计。在超导量子硬件上,小分子(H2,HeH+和LiH)的基态能量的计算精度提高了两个数量级.噪声电路的模拟深度超过1000两个量子位门被用来论证该方法的可扩展性。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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