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arXiv 1203.6003cond-mat.stat-mechcond-mat.dis-nnquant-ph
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量子平均场模型及其量子退火

On quantum mean-field models and their quantum annealing

Victor Bapst, Guilhem Semerjian

摘要:

本文研究了具有p-体铁磁相互作用和横场的量子自旋的全连通平均场模型。对于p=2,这对应于量子居里-外斯模型(Lipkin-Meshkov-Glick模型的特殊情况),其表现出二阶相变,而对于p>2,相变是一阶的。我们提供了一个精致的分析描述的静态和动态特性,这些模型。特别是,我们得到解析的指数衰减率的差距在一阶过渡。我们还研究了从纯横向场到纯铁磁体(反之亦然)的缓慢退火,并讨论了一级跃迁和亚稳性的亚稳极限对剩余激发能的影响,无论是有限的还是指数发散的退火时间。从量子计算的角度来看,这个量将评估量子绝热过程作为近似算法的效率。

英文摘要:

This paper deals with fully-connected mean-field models of quantum spins with p-body ferromagnetic interactions and a transverse field. For p=2 this corresponds to the quantum Curie-Weiss model (a special case of the Lipkin-Meshkov-Glick model) which exhibits a second-order phase transition, while for p>2 the transition is first order. We provide a refined analytical description both of the static and of the dynamic properties of these models. In particular we obtain analytically the exponential rate of decay of the gap at the first-order transition. We also study the slow annealing from the pure transverse field to the pure ferromagnet (and vice versa) and discuss the effect of the first-order transition and of the spinodal limit of metastability on the residual excitation energy, both for finite and exponentially divergent annealing times. In the quantum computation perspective this quantity would assess the efficiency of the quantum adiabatic procedure as an approximation algorithm.

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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