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arXiv 1111.2423quant-ph
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不同非马尔可夫环境模型下的量子关联动力学

Quantum correlations dynamics under different non-markovian environmental models

Ying-Jie Zhang, Wei Han, Chuan-Jia Shan, Yun-Jie Xia

摘要:

研究了不同环境模型对两个量子比特复合系统与两个独立环境相互作用的量子关联动力学的影响。分析了最常用的环境模型(单洛伦兹模型、平方洛伦兹模型、双洛伦兹模型和带隙模型)。首先,我们注意到,对于弱耦合区,量子关联的单调衰减速度主要取决于这些不同环境的谱密度函数。然后,通过考虑强耦合区,我们发现,相反,在弱耦合区,量子关联的动力学依赖于环境模型的非马尔可夫性,是独立的环境谱密度函数。

英文摘要:

We investigate the roles of different environmental models on quantum correlation dynamics of two-qubit composite system interacting with two independent environments. The most common environmental models (the single-Lorentzian model, the squared-Lorentzian model, the two-Lorentzian model and band-gap model) are analyzed. First, we note that for the weak coupling regime, the monotonous decay speed of the quantum correlation is mainly determined by the spectral density functions of these different environments. Then, by considering the strong coupling regime we find that, contrary to what is stated in the weak coupling regime, the dynamics of quantum correlation depends on the non-Markovianity of the environmental models, and is independent of the environmental spectrum density functions.

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