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arXiv 2301.09323quant-ph
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利用量子态距离评估开放量子系统时间演化中的非马尔可夫性

Non-Markovianity in the time evolution of open quantum systems assessed by means of quantum state distance

G. Mouloudakis, I. Stergou, P. Lambropoulos

AI总结:

本文通过构造开放XX链的密度矩阵并修改量子态距离度量以适用于迹衰减情形,定量评估了不同非马尔可夫谱密度下的非马尔可夫性,揭示了量子比特相互作用与非马尔可夫阻尼的微妙关系及平方洛伦兹库对耗散的显著减慢效应。

摘要:

我们对一个一端与库耦合的相互作用量子比特XX链进行了非马尔可夫性(NM)的定量评估。借助多种量子态距离(QSD)度量,评估了若干非马尔可夫谱密度的非马尔可夫性。我们的方法基于开放链密度矩阵的构造,无需主方程。为了量化非马尔可夫性,我们计算了马尔可夫阻尼情形与各类非马尔可夫阻尼情形之间量子态距离度量的动力学。由于文献中若干量子态距离度量以隐含迹守恒密度矩阵的形式出现,我们引入了适当的修改,使其适用于迹衰减的情形。结果表明各种量子态距离度量之间具有显著的一致性。它们还揭示了量子比特间相互作用与非马尔可夫阻尼之间微妙且潜在有用的相互作用。我们的计算还发现,平方洛伦兹库会导致耗散出现令人惊讶的急剧减慢。

英文摘要:

We provide a quantitative evaluation of non-Markovianity (NM) for an XX chain of interacting qubits with one end coupled to a reservoir. The NM of several non-Markovian spectral densities is assessed in terms of various quantum state distance (QSD) measures. Our approach is based on the construction of the density matrix of the open chain, without the necessity of a master equation. For the quantification of NM we calculate the dynamics of the QSD measures between the Markovian-damped and various types of non-Markovian-damped cases. Since in the literature several QSD measures, appear in forms that imply trace preserving density matrices, we introduced appropriate modifications so as to render them applicable to the case of decaying traces. The results produce remarkable consistency between the various QSD measures. They also reveal a subtle and potentially useful interplay between qubit-qubit interaction and non-Markovian damping. Our calculations have also uncovered a surprisingly dramatic slowing-down of dissipation by the squared Lorentzian reservoir.

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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