Daemonic ergotropy: enhanced work extraction from quantum correlations
Daemonic ergotropy: enhanced work extraction from quantum correlations
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DOI：
10.1038/s41534-017-0012-8
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发表时间：
2017-03-23
影响因子：
7.6
通讯作者：
Paternostro, Mauro
中科院分区：
文献类型：
--
作者：
Francica, Gianluca;Goold, John;Paternostro, Mauro
我们研究了量子关联的存在如何影响封闭量子系统中的功提取，建立了量子非平衡热力学领域和量子信息理论领域之间的新联系。我们考虑一个二分量子系统，我们表明，它是可能的优化工作提取的过程中，由于系统的两个部分之间的相关性，通过使用适当的反馈协议的概念的基础上遍历。我们证明，在提取的工作中的最大增益是有关的两个部分之间的量子相关性的存在，量化的量子不和谐或，对于纯态，纠缠。然后，我们说明了我们的一般性研究结果的一个简单的物理情况组成的量子位系统。
We investigate how the presence of quantum correlations can influence work extraction in closed quantum systems, establishing a new link between the field of quantum non-equilibrium thermodynamics and the one of quantum information theory. We consider a bipartite quantum system and we show that it is possible to optimize the process of work extraction, thanks to the correlations between the two parts of the system, by using an appropriate feedback protocol based on the concept of ergotropy. We prove that the maximum gain in the extracted work is related to the existence of quantum correlations between the two parts, quantified by either quantum discord or, for pure states, entanglement. We then illustrate our general findings on a simple physical situation consisting of a qubit system.