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arXiv 1911.07186quant-ph
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具有弛豫的$p$ -自旋模型的反向量子退火

Reverse quantum annealing of the $p$-spin model with relaxation

Gianluca Passarelli, Ka-Wa Yip, Daniel A. Lidar, Hidetoshi Nishimori, Procolo Lucignano

摘要:

在反向量子退火中,初始状态是最终问题哈密顿量的本征态,并且横向场是循环的,而不是像标准(正向)量子退火中那样严格地减少。我们提出了一个数值研究的反向量子退火协议适用于$p$ -自旋模型($p=3$),包括暂停,在一个开放的系统设置占失相的能量本征基,从而导致热弛豫。我们认为独立和集体退相,并证明在这两种情况下,开放系统的动力学大大提高了反向退火的性能。也就是说,包括退相克服了纯封闭系统反向退火收敛到$p$ -自旋模型的基态的失败。我们证明,暂停进一步提高了成功的概率。集体失相模型导致比独立失相更好的性能。我们考虑的协议与当前一代商业量子退火机中实现的协议密切对应,我们的结果有助于解释为什么最近的实验表明在反向退火和暂停下成功概率提高。

英文摘要:

In reverse quantum annealing, the initial state is an eigenstate of the final problem Hamiltonian and the transverse field is cycled rather than strictly decreased as in standard (forward) quantum annealing. We present a numerical study of the reverse quantum annealing protocol applied to the $p$-spin model ($p=3$), including pausing, in an open system setting accounting for dephasing in the energy eigenbasis, which results in thermal relaxation. We consider both independent and collective dephasing and demonstrate that in both cases the open system dynamics substantially enhances the performance of reverse annealing. Namely, including dephasing overcomes the failure of purely closed system reverse annealing to converge to the ground state of the $p$-spin model. We demonstrate that pausing further improves the success probability. The collective dephasing model leads to somewhat better performance than independent dephasing. The protocol we consider corresponds closely to the one implemented in the current generation of commercial quantum annealers, and our results help to explain why recent experiments demonstrated enhanced success probabilities under reverse annealing and pausing.

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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