论文标题

不可逆工作中的量子连贯性和关键性

Quantum coherence and criticality in irreversible work

论文作者

Varizi, Adalberto D., Vieira, André P., Cormick, Cecilia, Drumond, Raphael C., Landi, Gabriel T.

论文摘要

驾驶协议期间的不可逆工作构成了非平衡热力学中最广泛研究的措施之一,因为它构成了熵产生的代理。在量子系统中,已经表明,由于驾驶协议产生的相干性,不可逆的工作具有额外的,真正的量子机械贡献。本文的目的是探索在进行量子相变的系统中的这种贡献。近年来,已经付出了巨大的努力来了解量子关键在工作方案中的作用。但是,几乎一无所知。为了阐明这个问题,我们研究了一维XY模型的无限淬火中的熵产生。对于横向场中的淬火,我们发现在有限的温度下,在某些情况下,连贯性的贡献实际上可以解释所有熵产生。然而,在低温下,连贯性在临界点显示有限的尖尖,而熵产生的对数分化。或者,如果在各向异性参数中执行淬灭,我们发现在某些情况下,所有产生的熵都是由于量子相干引起的。

The irreversible work during a driving protocol constitutes one of the most widely studied measures in non-equilibrium thermodynamics, as it constitutes a proxy for entropy production. In quantum systems, it has been shown that the irreversible work has an additional, genuinely quantum mechanical contribution, due to coherence produced by the driving protocol. The goal of this paper is to explore this contribution in systems that undergo a quantum phase transition. Substantial effort has been dedicated in recent years to understand the role of quantum criticality in work protocols. However, practically nothing is known about how coherence contributes to it. To shed light on this issue, we study the entropy production in infinitesimal quenches of the one-dimensional XY model. For quenches in the transverse field, we find that for finite temperatures the contribution from coherence can, in certain cases, account for practically all of the entropy production. At low temperatures, however, the coherence presents a finite cusp at the critical point, whereas the entropy production diverges logarithmically. Alternatively, if the quench is performed in the anisotropy parameter, we find that there are situations where all of the entropy produced is due to quantum coherences.

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