Entanglement dynamics of two independent qubits in environments with and without memory
Entanglement dynamics of two independent qubits in environments with and without memory
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DOI：
10.1103/physreva.77.032342
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发表时间：
2008-03-01
影响因子：
2.9
通讯作者：
Compagno, G.
中科院分区：
文献类型：
--
作者：
Bellomo, B.;Lo Franco, R.;Compagno, G.
分析了当两个量子比特初始处于混合扩展类Werner-like态且各自处于零温非马尔可夫环境时，两个量子比特纠缠的动力学行为.给出了纠缠动力学与初态的纠缠度和纠缠纯度以及非马尔可夫性的关系。这扩展了先前关于非马尔可夫效应对初始类贝尔态的两量子比特纠缠动力学的影响的工作[Bellomo等人，物理修订信函99，160502（2007）]。最后研究了马尔可夫环境中非零温度对两量子比特纠缠动力学的影响。
Here is analyzed the dynamics of two-qubit entanglement, when the two qubits are initially in a mixed extended Werner-like state and each of them is in a zero temperature non-Markovian environment. The dependence of entanglement dynamics on the purity and degree of entanglement of the initial states and on the amount of non-Markovianity is also given. This extends the previous work about non-Markovian effects on the two-qubit entanglement dynamics for initial Bell-like states [Bellomo et al., Phys. Rev. Lett. 99, 160502 (2007)]. The effect on the two-qubit entanglement dynamics of nonzero temperature in Markovian environments is finally studied.