Dissipative dynamics of an open quantum battery
Dissipative dynamics of an open quantum battery
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DOI：
10.1088/1367-2630/abaa01
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发表时间：
2020-08-01
影响因子：
3.3
通讯作者：
Sassetti, M.
中科院分区：
文献类型：
--
作者：
Carrega, M.;Crescente, A.;Sassetti, M.
与外部环境的耦合不可避免地会影响量子系统的动力学。在这里，我们考虑如何充电性能的量子电池，建模为两个级别的系统，是由欧姆热库的存在的影响。后者耦合到量子电池的纵向和横向自旋分量，包括退相干和纯退相机制。量子电池的充电和放电动力学，受到静态驱动，利用适当的映射到所谓的自旋玻色子模型。分析表达式的时间演化的能量存储在弱耦合制度依赖于一个系统的弱阻尼膨胀。在这里，退相干和纯退相耗散耦合进行了详细讨论。我们认为，前者的结果在更好的充电性能，也显示出有趣的功能，让人想起的兰姆移位水平分裂重整化诱导的存在下的水库。充电稳定性也通过在充电协议已经关闭之后监测能量行为来解决。这项研究提出了一个研究弛豫效应的一般框架，也能够包括非马尔可夫效应，它揭示了控制和可能的工程系统浴耦合在实现量子电池中的重要性。
Coupling with an external environment inevitably affects the dynamics of a quantum system. Here, we consider how charging performances of a quantum battery, modelled as a two level system, are influenced by the presence of an Ohmic thermal reservoir. The latter is coupled to both longitudinal and transverse spin components of the quantum battery including decoherence and pure dephasing mechanisms. Charging and discharging dynamics of the quantum battery, subjected to a static driving, are obtained exploiting a proper mapping into the so-called spin-boson model. Analytic expressions for the time evolution of the energy stored in the weak coupling regime are presented relying on a systematic weak damping expansion. Here, decoherence and pure dephasing dissipative coupling are discussed in details. We argue that the former results in better charging performances, showing also interesting features reminiscent of the Lamb shift level splitting renormalization induced by the presence of the reservoir. Charging stability is also addressed, by monitoring the energy behaviour after the charging protocol has been switched off. This study presents a general framework to investigate relaxation effects, able to include also non Markovian effects, and it reveals the importance of controlling and, possibly, engineering system-bath coupling in the realization of quantum batteries.