arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.10803quant-ph
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光子退相动力学和初始关联的作用

Photonic dephasing dynamics and role of initial correlations

Sina Hamedani Raja, K P Athulya, Anil Shaji, Jyrki Piilo

摘要:

开放量子系统的动力学依赖于不同类型的初始关联。一方面,当系统和环境都是固有的多部,初始的组合环境各方之间的相关性,使动态地图的非本地,尽管系统和环境之间的相互作用的局部性质。另一方面,开放系统与其环境之间的初始相关性使人们无法定义一个完全正的动力学映射。最近,退相动力学的光子已被用于这两个框架-理论和实验-证明一些基本的和适用的方面的开放系统动力学和记忆效应。然而,在这方面的早期研究往往是完全基于概念的退相干函数。因此,我们仍然缺乏明确的主方程描述相关的复合初始环境状态诱导的动力学。此外,缺乏对初始系统-环境相关性如何影响光子背景下量子比特动力学的详细理解。在本文中,我们推导出通用的主方程的减少退相动力学的双光子偏振态时,两部分的环境频率自由度最初相关。因此,我们显示的运营商的形式和主方程的初始频率相关性和各种类型的频率分布的影响的衰减率的显式依赖。此外,我们使用最近开发的浴正分解方法来处理初始相关的偏振-频率状态的光子,并证明这是如何允许新的见解和详细的信息,不同的起源的贡献如何影响光子退相。

英文摘要:

Dynamics of open quantum systems depends on different types of initial correlations. On the one hand, when system and environment are both inherently multipartite, initial correlations between the parties of the composite environment make the dynamical map non-local, despite of local nature of the interaction between each party of the system and the environment. On the other hand, initial correlations between the open system and its environment prevents one from defining a completely positive dynamical map. Recently, dephasing dynamics of photons has been used in both of these frameworks - theoretically and experimentally - to demonstrate some fundamental and applicable aspects of open system dynamics and memory effects. However, the earlier studies in this context are often based solely on the concept of decoherence functions. Therefore, we still lack explicit master equation descriptions for dynamics induced by correlated composite initial environmental states. Also, a detailed understanding how initial system-environment correlations influence qubit dynamics in the photonic context is missing. In this paper, we derive generic master equations for the reduced dephasing dynamics of the two-photon polarization state when the bipartite environmental frequency degrees of freedom are initially correlated. We thereby show the explicit dependence of the operator form and the decay rates of the master equation on the initial frequency correlations and the influence of various types of frequency distributions. Furthermore, we use recently developed bath positive decomposition method to treat initially correlated polarization-frequency state of a photon, and demonstrate how this allows new insight and detailed information on how the contributions of different origin influence the photonic dephasing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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