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arXiv 2204.09522quant-phcond-mat.stat-mech
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非马尔可夫碰撞模型中的熵产生:信息回流与系统-环境相关性

Entropy production in non-Markovian collision models: Information backflow vs system-environment correlations

Hüseyin T. Şenyaşa, Şahinde Kesgin, Göktuğ Karpat, Barış Çakmak

摘要:

我们研究了在马尔可夫和非马尔可夫状态下,量子比特与微观碰撞模型模拟的环境接触时的不可逆熵产生。我们的主要目标是为讨论非马尔可夫动力学与负熵产生率之间的关系做出贡献。我们采用了两种不同类型的碰撞模型,做或不保持系统和传入的环境粒子之间建立的相关性,而它们都属于他们的非马尔可夫性质,通过从环境到系统的信息回流。我们观察到,作为前一个模型,其中系统和环境之间的相关性被保存,引起的瞬态动力学的负熵产生率,后者总是保持正的速率,即使收敛到稳态值相比,相应的马尔可夫动力学。我们的研究结果表明,支持负熵产生率的机制不仅仅是通过信息回流的非马尔可夫性,而是通过建立系统-环境相关性对它的贡献。

英文摘要:

We investigate the irreversible entropy production of a qubit in contact with an environment modelled by a microscopic collision model both in Markovian and non-Markovian regimes. Our main goal is to contribute to the discussions on the relationship between non-Markovian dynamics and negative entropy production rates. We employ two different types of collision models that do or do not keep the correlations established between the system and the incoming environmental particle, while both of them pertain to their non-Markovian nature through information backflow from the environment to the system. We observe that as the former model, where the correlations between the system and environment is preserved, gives rise to negative entropy production rates in the transient dynamics, the latter one always maintains positive rates, even though the convergence to the steady-state value is slower as compared to the corresponding Markovian dynamics. Our results suggest that the mechanism underpinning the negative entropy production rates is not solely non-Markovianity through information backflow, but rather the contribution to it through established system-environment correlations.

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