Competition between memory-keeping and memory-erasing decoherence channels
Competition between memory-keeping and memory-erasing decoherence channels
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DOI：
10.1103/physreva.90.012310
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发表时间：
2014-07-08
影响因子：
2.9
通讯作者：
Paternostro, Mauro
中科院分区：
文献类型：
--
作者：
Apollaro, Tony J. G.;Lorenzo, Salvatore;Paternostro, Mauro
我们研究了同时作用于单个自旋的马尔可夫和非马尔可夫退相干机制的竞争效应。我们证明了在这些机制的相对强度中存在一个阈值，超过这个阈值，自旋动力学就变成完全的马尔可夫性，正如使用几个非马尔可夫性测量所揭示的那样。我们确定了这些阈值的测量依赖嵌套结构，暗示了我们分析中使用的各种非马尔可夫性证人之间的因果关系。然后，我们的考虑被用来论证暴露于内在和马尔可夫技术噪声（后者的强度是任意的）的单电子量子点不可避免的非马尔可夫进化。
We study the competing effects of simultaneous Markovian and non-Markovian decoherence mechanisms acting on a single spin. We show the existence of a threshold in the relative strength of such mechanisms above which the spin dynamics becomes fully Markovian, as revealed by the use of several non-Markovianity measures. We identify a measure-dependent nested structure of such thresholds, hinting at a causality relationship among the various non-Markovianity witnesses used in our analysis. Our considerations are then used to argue the unavoidably non-Markovian evolution of a single-electron quantum dot exposed to both intrinsic and Markovian technical noise, the latter of arbitrary strength.