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arXiv 1507.02529quant-ph
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一般环境下从非马尔可夫到马尔可夫动力学的转变

The transition from non-Markovian to Markovian dynamics for generic environments

Nephtalí Garrido, Thomas Gorin, Carlos Pineda

摘要:

利用随机矩阵研究了两能级系统与一般环境相互作用的约化动力学。在弱耦合极限下,该结果可以直接由已知的纯度衰变结果得到,并得到马尔可夫动力学。然后,我们专注于强耦合的情况下,当动态是已知的非马尔可夫。在这种情况下,耦合占主导地位的局部部分的哈密顿量,因此,我们把后者作为一个扰动的前。借助于线性响应近似,这使我们能够获得简化动力学的解析描述。最后,我们发现从非马尔可夫到马尔可夫动力学的一个过渡点的耦合和当地的哈密顿量是可比的大小。

英文摘要:

Using random matrices, we study the reduced dynamics of a two level system interacting with a generic environment. In the weak coupling limit, the result can be obtained directly from known results for purity decay, and result in Markovian dynamics. We then focus on the case of strong coupling, when the dynamics is known to be non-Markovian. In this regime, the coupling dominates over the local parts of the Hamiltonian, and thus we treat the latter as a perturbation of the former. With the help of the linear response approximation, this allows us to obtain an analytical description of the reduced dynamics. Finally, we find a transition from non-Markovian to Markovian dynamics at a point where the coupling and the local Hamiltonian are comparable in size.

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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