arXiv 2005.084892020-05quant-phcond-mat.stat-mech

开放量子系统中相干态的各向异性

Ergotropy from coherences in an open quantum system

Barış Çakmak

备注：: 12 pages, 4 figures. v3 includes a new appendix on the relationship between ergotropy and quantum correlations, together with updated main text and references. Matches the published version
发表信息：: Phys. Rev. E 102, 042111 (2020)
DOI：: 10.1103/PhysRevE.102.042111

摘要：

我们表明，它是可能的非零各向异性在稳态的开放量子系统组成的量子比特，集体耦合到一个热浴在有限的温度。当系统中的量子比特数大于1时，我们模型的动力学将量子比特引入到一个能量本征基具有相干性的稳态。我们观察到，即使系统没有反转的布居数，也可以从相干性中提取功，并分析表明，在高温极限下，每单位能量的各向异性等于两个量子比特情况下的相干性的$l_1$范数。进一步，我们分析了不同初始状态下系统的相干性和各向异性随量子比特数的变化。我们的研究结果表明，可以设计一个量子电池，在弱耦合制度的耗散热浴充电。

英文摘要：

We show that it is possible to have non-zero ergotropy in the steady-states of an open quantum system consisting of qubits that are collectively coupled to a thermal bath at a finite temperature. The dynamics of our model leads the qubits into a steady-state that has coherences in the energy eigenbasis when the number of qubits in the system is more than one. We observe that even though the system do not have inverted populations, it is possible to extract work from the coherences and analytically show that in the high temperature limit, ergotropy per unit energy is equal to the $l_1$ norm of coherence for the two qubit case. Further, we analyze the scaling of coherence and ergotropy as a function of the number of qubits in the system for different initial states. Our results suggest that one can design a quantum battery that is charged by a dissipative thermal bath in the weak coupling regime.

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英文摘要：

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