Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università di Messina, I-98166 Messina, Italy.
Institute of Spintronics and Quantum Information, Adam Mickiewicz University, 61-614, Poznan, Poland.
Phys Rev Lett. 2023 Mar 24;130(12):123601. doi: 10.1103/PhysRevLett.130.123601.
Pure dephasing originates from the nondissipative information exchange between quantum systems and environments, and plays a key role in both spectroscopy and quantum information technology. Often pure dephasing constitutes the main mechanism of decay of quantum correlations. Here we investigate how pure dephasing of one of the components of a hybrid quantum system affects the dephasing rate of the system transitions. We find that, in turn, the interaction, in the case of a light-matter system, can significantly affect the form of the stochastic perturbation describing the dephasing of a subsystem, depending on the adopted gauge. Neglecting this issue can lead to wrong and unphysical results when the interaction becomes comparable to the bare resonance frequencies of subsystems, which correspond to the ultrastrong and deep-strong coupling regimes. We present results for two prototypical models of cavity quantun electrodynamics: the quantum Rabi and the Hopfield model.
纯退相源于量子系统与环境之间的非耗散信息交换，在光谱学和量子信息技术中都起着关键作用。通常，纯退相是量子相关衰减的主要机制。在这里，我们研究了混合量子系统的一个分量的纯退相如何影响系统跃迁的退相速率。我们发现，在光物质系统的情况下，相互作用可以根据采用的规范显著影响描述子系统退相的随机微扰的形式。当相互作用变得与子系统的基本共振频率相当（对应于超强度和深度强耦合）时，忽略这个问题可能会导致错误和非物理的结果。我们给出了腔量子电动力学的两个典型模型的结果：量子拉比和霍普菲尔德模型。
