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arXiv 1503.03455cond-mat.stat-mechquant-ph
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量子卡诺热机的热力学普适性

Thermodynamic universality of quantum Carnot engines

Bartłomiej Gardas, Sebastian Deffner

摘要:

热力学第二定律的卡诺陈述对所有热机的效率提出了上限。最近,已经研究了诸如相干性和量子纠缠的通用量子特征是否可以允许量子器件具有大于卡诺效率的效率。目前的研究表明,这是不允许的热力学热力学定律。特别是,我们将证明,而不是热的定义必须修改,以考虑到维持相干性和纠缠的热力学成本。我们的理论研究结果数值说明了实验相关的例子,从光学力学。

英文摘要:

The Carnot statement of the second law of thermodynamics poses an upper limit on the efficiency of all heat engines. Recently, it has been studied whether generic quantum features such as coherence and quantum entanglement could allow for quantum devices with efficiencies larger than the Carnot efficiency. The present study shows that this is not permitted by the laws of thermodynamics. In particular, we will show that rather the definition of heat has to be modified to account for the thermodynamic cost for maintaining coherence and entanglement. Our theoretical findings are numerically illustrated for an experimentally relevant example from optomechanics.

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