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The influence of mixed classical dephasing noisy channels on the dynamics of two-qubit correlations

机译:混合经典去相位噪声信道对双量子比特相关性动力学的影响

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摘要

In two independent local transmitting channels, we investigate the dynamics of entropy disorder, purity, and entanglement negativity in a two-qubit system with mixed static (STC) and Ornstein-Uhlenbeck (OU) noise. Because the OU and STC noises induce Markovianity and non-Markovianity in two classical channels, respectively, it is initially assumed that the two-qubit system is built in a Werner state form. Furthermore, the effect of noise, channel, and state parameters on entropy disorder, purity, and negativity in a two-qubit system has been thoroughly investigated. The dephasing effects of the mixed STC-OU noise differ significantly from the individual STC and OU noises. When influenced by the mixed STC-OU noise, the system preserves entanglement and purity by avoiding entropy over a longer time period. We find that the system can preserve quantum correlations for a longer period of time when weakly coupled to the classical field while setting the noise parameters to their least potential values. In comparison, the negativity measure has been found more effective in encountering smaller variations in entanglement. Entanglement sudden death and birth is witnessed to be regulated by the STC noise parameter and associated coupling strength of the classical field. In addition, a non-Markovian dynamical map of the system is obtained which contradicts the previous results under pure OU noise.
机译:在两个独立的局部传输通道中,我们研究了具有混合静态 (STC) 和 Ornstein-Uhlenbeck (OU) 噪声的双量子比特系统中熵无序、纯度和纠缠负性的动力学.由于OU和STC噪声分别在两个经典信道中诱导了马尔可夫性和非马尔可夫性,因此最初假设双量子比特系统是以Werner态形式构建的。此外,还深入研究了噪声、信道和状态参数对双量子比特系统中熵无序、纯度和负性的影响。STC-OU混合噪声的退相效应与单个STC和OU噪声有显著差异。当受到STC-OU混合噪声的影响时,系统通过避免较长时间的熵来保持纠缠和纯度。我们发现,当与经典场弱耦合时,系统可以在较长的时间内保持量子相关性,同时将噪声参数设置为最小势值。相比之下,负性测量在遇到较小的纠缠变化时被发现更有效。纠缠猝死和出生受经典场的STC噪声参数和相关耦合强度的调控。此外,还得到了系统的非马尔可夫动力学图,这与之前在纯OU噪声下的结果相矛盾。

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