Non-Markovianity of local dephasing channels and time-invariant discord
Non-Markovianity of local dephasing channels and time-invariant discord
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DOI：
10.1103/physreva.87.010103
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发表时间：
2013-01-24
影响因子：
2.9
通讯作者：
Maniscalco, S.
中科院分区：
文献类型：
--
作者：
Haikka, P.;Johnson, T. H.;Maniscalco, S.
我们研究了欧姆类谱下量子比特的非马尔可夫性和信息流。我们证明了存在一个温度依赖的临界值的欧姆参数的发病的非Markovianity，并给出了这种现象的物理解释，将其连接到形式的水库频谱。我们证明，这种联系也适用于更一般的光谱。我们揭示了一类初始状态的不和谐是永远冻结在一个积极的价值。我们连接时不变的不和谐的非马尔可夫性，并提出了一个物理系统中，它可以被观察到。DOI：10.1103/PhysRevA.87.010103
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 parameters 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. DOI: 10.1103/PhysRevA.87.010103