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理论物理通讯：英文版

Connections of Coherent Information, Quantum Discord, and Entanglement

付慧娟, 李军刚, 邹健, 邵彬

Published Apr 15, 2012• 0 citations
OpenAlex

Abstract

为一个纯 non-markovian dephasing 模型，我们导出协调信息，量不一致，和纠纷的分析表情。我们发现为起始的沃纳状态的盒子，协调信息的动态行为类似于量不一致的但是与纠纷的不同。协调信息，以及量不一致，能在某混合状态，纠纷在是零揭示量关联。

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我们在零温度，其各个与 Lorentzian 由一个漏的洞被建模在三座独立 non-Markovian 水库为一个混合 three-qubit W 类型状态调查 pairwise 量不一致(QD ) 的动力学光谱密度。环境 non-Markovianity，在 qubit 频率之间的 detuning 和洞中心频率的数量的影响，和 QD 动力学上的起始的状态的纯净详细被分析。在 non-Markovian 政体，系统水库相互作用导致 QD 苏醒，摆动不管 detuning 是否是零，这被发现。而且，如果 non-Markovian 条件和 detuning 条件同时满足， QD 能很长时间被保存。
量和古典关联的 non-Markovian decoherence 是当二 qubits 不均匀地受到小点时，获得的经分解扭动隧道和阶段扭动隧道。为起始的混合状态的一个班，量关联与古典关联同时地由量不一致腐烂确定了。量和古典关联的腐烂的率突然在典型时间改变的发现被距离身体上从量状态解释到最近古典的状态。在大时间间隔，量关联比古典关联大。量和古典关联能经由描绘环境记忆效果的核在时间的一个更长的时期上被保存。
We study non-Markovianity and information flow for qubits experiencing local dephasing with an Ohmic class spectrum. We demonstrate the existence of a temperature-dependent critical value of the Ohmicity parameter sss for the onset of non-Markovianity and give a physical interpretation of this phenomenon by linking it to the form of the reservoir spectrum. We demonstrate that this link holds also for more general spectra. We unveil a class of initial states for which discord is forever frozen at a positive value. We connect time-invariant discord to non-Markovianity and propose a physical system in which it could be observed.