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arXiv 2302.11255quant-phcond-mat.stat-mech
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量子伊辛模型中功的准概率分布

Quasiprobability distribution of work in the quantum Ising model

Gianluca Francica, Luca Dell'Anna

AI总结:

本文研究横场伊辛模型在全局和局域淬火下的功准概率分布,发现局域淬火可通过负四阶矩揭示量子上下文性,并分析了量子相变临界特征及初始相干性的资源作用。

摘要:

当能量基中存在初始量子相干性时,对量子多体系统参数淬火所做功的统计仍缺乏完整理解。在这种情况下,功可以由一类准概率分布表示。本文通过研究横场伊辛模型的功准概率,试图澄清该过程的真正量子特征。我们同时考虑全局淬火和局域淬火,主要关注热力学极限。我们发现,对于全局淬火,存在一种对称的非上下文表示,其功服从高斯概率分布;而对于局域淬火,我们可以得到量子上下文性,其信号表现为功的负四阶矩。此外,我们考察了与量子相变相关的临界特征,以及初始量子相干性作为有用资源的作用。

英文摘要:

A complete understanding of the statistics of the work done by quenching a parameter of a quantum many-body system is still lacking in the presence of an initial quantum coherence in the energy basis. In this case, the work can be represented by a class of quasiprobability distributions. Here, we try to clarify the genuinely quantum features of the process by studying the work quasiprobability for an Ising model in a transverse field. We consider both a global and a local quench, by focusing mainly on the thermodynamic limit. We find that, while for a global quench there is a symmetric non-contextual representation with a Gaussian probability distribution of work, for a local quench we can get quantum contextuality as signaled by a negative fourth moment of the work. Furthermore, we examine the critical features related to a quantum phase transition and the role of the initial quantum coherence as useful resource.

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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