Decoherence approach to energy transfer and work done by slowly driven systems
Decoherence approach to energy transfer and work done by slowly driven systems
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能量传输的退相干方法和缓慢驱动系统所做的功
DOI：
10.1103/physreve.97.012128
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发表时间：
2018
影响因子：
2.4
通讯作者：
Wang Wen-ge
中科院分区：
文献类型：
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作者：
Wang Wen-ge
在计算量子系统的能量传递或所做的功时遇到的一个主要问题是，系统可能处于其能量本征态的相干态。众所周知，当能量基给出的优选基发生了所谓的环境诱导退相干时，能量基之间不存在相干性，可以确定地计算出系统的能量变化。我认为，人们可以利用这一性质，为不包括任何测量仪器的整个系统寻找量子功的适当定义。为了说明这个想法是如何工作的，在本文中，我研究了一个一般慢驱动系统的退相干特性，该系统与一个主体是复杂量子系统的巨大环境弱耦合。结果表明，这种系统一般会发生退相干现象。
A main problem, which is met when computing the energy transfer of or work done by a quantum system, comes from the fact that the system may lie in states with coherence in its energy eigenstates. As is well known, when the so-called environment-induced decoherence has happened with respect to a preferred basis given by the energy basis, no coherence exists among the energy basis and the energy change of the system can be computed in a definite way. I argue that one may make use of this property, in the search for an appropriate definition of quantum work for a total system that does not include any measuring apparatus. To show how this idea may work, in this paper, I study decoherence properties of a generic slowly driven system, which is weakly coupled to a huge environment whose main body is a complex quantum system. It is shown that decoherence may generically happen for such a system.