arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2205.07097quant-phphysics.chem-ph
收藏

利用量子自旋投影自适应构建用于费米子系统的更浅量子电路

Adaptive construction of shallower quantum circuits with quantum spin projection for fermionic systems

Takashi Tsuchimochi, Masaki Taii, Taisei Nishimaki, Seiichiro L. Ten-no

AI总结:

针对自适应 VQE 电路破坏哈密顿量对称性导致深度增加的问题,本文提出量子自旋投影约束,使态保持正确对称空间,从而减少门操作并改善分子性质计算。

摘要:

量子计算是利用分子系统中强关联的一种有前景的方法;然而,当前设备只允许采用电路深度较浅的量子-经典混合算法,例如变分量子本征求解器(VQE)。在本研究中,我们阐述了哈密顿量对称性在自适应构建 VQE 电路中的重要性。这种处理往往会破坏对称性,从而降低向精确解收敛的保真度,并最终导致电路更深。我们证明,对称投影可通过将量子态保持在正确的对称空间内,为该问题提供一种简单而有效的解决方案,以减少总体门操作。该方案还揭示了在计算分子性质时保持对称性的重要性,我们的示例计算对此进行了演示。

英文摘要:

Quantum computing is a promising approach to harnessing strong correlation in molecular systems; however, current devices only allow for hybrid quantum-classical algorithms with a shallow circuit depth, such as the variational quantum eigensolver (VQE). In this study, we report the importance of the Hamiltonian symmetry in constructing VQE circuits adaptively. This treatment often violates symmetry, thereby deteriorating the convergence of fidelity to the exact solution, and ultimately resulting in deeper circuits. We demonstrate that symmetry-projection can provide a simple yet effective solution to this problem, by keeping the quantum state in the correct symmetry space, to reduce the overall gate operations. The scheme also reveals the significance of preserving symmetry in computing molecular properties, as demonstrated in our illustrative calculations.

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。

↑