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arXiv 2004.11813quant-ph
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操作量子非马尔可夫性的微扰理论

Perturbation theory for operational quantum non-Markovianity

Mariano Bonifacio, Adrián A. Budini

摘要:

在量子非马尔可夫性的操作方法中,记忆的定义取决于与在感兴趣的系统上执行的连续测量过程相关的不同结果集的统计特性。使用投影仪技术,我们开发了一个扰动理论,能够表达联合概率和结果的相关性方面的未扰动系统密度矩阵传播。该对象定义了在没有测量过程的情况下的开放系统动力学。连续的系列条款,这是缩放的系统-环境相互作用强度,包括在卷积结构,涉及系统传播加权高阶浴相关性。通过研究承认一个准确的描述不同的动力学证实了形式主义。利用微扰方法,在有限温度库中发现了由系统-环境相互作用和测量过程之间的相互作用引起的异常记忆效应。

英文摘要:

The definition of memory in operational approaches to quantum non-Markovianity depends on the statistical properties of different sets of outcomes related to successive measurement processes performed over the system of interest. Using projectors techniques we develop a perturbation theory that enables to expressing both joint probabilities and outcome correlations in terms of the unperturbed system density matrix propagator. This object defines the open system dynamics in absence of measurement processes. Successive series terms, which are scaled by the system-environment interaction strength, consist in a convolution structure involving system propagators weighted by higher order bath correlations. The formalism is corroborated by studying different dynamics that admit an exact description. Using the perturbative approach, unusual memory effects induced by the interplay between the system-environment interaction and measurement processes are found in finite temperature reservoirs.

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