Structured quantum collision models: generating coherence with thermal resources
Structured quantum collision models: generating coherence with thermal resources
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DOI：
10.1088/1367-2630/ad202a
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发表时间：
2023-07
影响因子：
3.3
通讯作者：
S. Cusumano;G. De Chiara
中科院分区：
文献类型：
--
作者：
S. Cusumano;G. De Chiara
量子碰撞模型通常由一个系统与一组代表环境的辅助单元相互作用组成。虽然这些辅助系统通常被认为是两级系统或谐波振荡器，但在这项工作中，我们进一步将每个辅助系统表示为一个结构化系统，即由两个或多个子系统组成的系统。我们将展示这种情况如何修改人们可以为开放系统的演化获得的那种主方程。此外，我们能够考虑一种情况，即辅助状态是热的，但有一定的相干性。这允许在开放系统的稳定状态下产生相干性，并且由于碰撞模型的简单性，这使我们能够更好地理解在系统中创建相干性的热力学成本。具体来说，我们表明，让系统与相干自由度相互作用需要一个功成本，导致热力学第一定律和第二定律的自然实现，而不需要特别的公式。
Quantum collision models normally consist of a system interacting with a set of ancillary units representing the environment. While these ancillary systems are usually assumed to be either two level systems or harmonic oscillators, in this work we move further and represent each ancillary system as a structured system, i.e. a system made out of two or more subsystems. We show how this scenario modifies the kind of master equation that one can obtain for the evolution of the open systems. Moreover, we are able to consider a situation where the ancilla state is thermal yet has some coherence. This allows the generation of coherence in the steady state of the open system and, thanks to the simplicity of the collision model, this allows us to better understand the thermodynamic cost of creating coherence in a system. Specifically, we show that letting the system interact with the coherent degrees of freedom requires a work cost, leading to the natural fulfillment of the first and second law of thermodynamics without the necessity of ad hoc formulations.