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理论物理通讯：英文版

Dynamics of Quantum Discord in Asymmetric and Local Non-Markovian Environments

郝翔, Pan Yu Tao, 沙金巧, 朱士群

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

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。

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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。
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。
The non-Markovian decoherence of quantum and classical correlations is analytically obtained when two qubits are asymmetrically subjected to the bit flip channel and phase flip channel. For one class of initial mixed states, quantum correlations quantified by quantum discord decay synchronously with classical correlations. The discovery that the decaying rates of quantum and classical correlations suddenly change at the characteristic time is physically interpreted by the distance from quantum state to the closest classical states. In a large time interval, quantum correlations are greater than classical correlations. The quantum and classical correlations can be preserved over a longer period of time via the kernel characterizing the environment memory effects.
We investigate the influences of non-Markovian dissipation and global dephasing process on the dynamical behaviors of global discord among four qubits.We find that for the non-Markovian dissipation model W state is the most robust to decoherence compared to Dicke and GHZ states;however,for the global dephasing model Dicke state is the most robust to decoherence among them.Also the dynamical behaviors of global quantum discord are quite different from that of the multipartite entanglement for the non-Markovian dissipation model,while they are very similar to each other for the global dephasing model.