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首页> 外文期刊>Journal of physics, A. Mathematical and theoretical >Decoherence and disentanglement scenarios in non-Markovian quantum Brownian motion
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Decoherence and disentanglement scenarios in non-Markovian quantum Brownian motion

机译:非马氏量子布朗运动中的退相干和解纠缠场景

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摘要

We study the non-Markovian decoherence and disentanglement dynamics of dissipative quantum systems with special emphasis on non-Gaussian continuous variable systems. The dynamics are described by the Hu-Paz-Zhang master equation of quantum Brownian motion. The time evolution of the decoherence function of a single-mode superposition is compared to the concurrence of a two-mode entangled state. It is verified that moderate non-Markovian influences slow down the decay of interference fringes and quantum correlations, while strong non-Markovian effects resulting from an out-of-resonance bath can even accelerate the loss of coherence, compared to predictions of Markovian approximations. Qualitatively different scenarios including exponential, Gaussian or algebraic decay of the decoherence function are analyzed. It is shown that partial revivals of coherence can occur in case of non-Lindblad-type dynamics.
机译:我们研究耗散量子系统的非马尔可夫退相干和纠缠动力学,特别着重于非高斯连续变量系统。动力学由量子布朗运动的Hu-Paz-Zhang主方程描述。将单模叠加的退相干函数的时间演化与双模纠缠态的并发进行比较。事实证明,与马尔可夫近似的预测相比,适度的非马尔可夫影响减慢了干涉条纹和量子相关性的衰减,而共振共振浴导致的强大非马尔可夫效应甚至可以加速相干损失。分析定性不同的场景,包括退相干函数的指数衰减,高斯衰减或代数衰减。结果表明,在非林德布拉德动力学的情况下,可能会部分恢复连贯性。

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