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arXiv quant-ph/0008115quant-ph
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量子纠缠的动力学

Dynamics of quantum entanglement

Karol Zyczkowski, Pawel Horodecki, Michal Horodecki, Ryszard Horodecki

摘要:

研究了二体量子态纠缠的离散动力学模型。它涉及到系统的全局幺正动力学和局部双随机或衰减信道的周期作用。对于初始纯态,纠缠的衰减伴随着系统的冯诺伊曼熵的增加。我们观察并讨论了由于两个子系统的幺正相互作用而引起的纠缠的恢复。对于两个子系统的边缘熵不同的混合态(其中一个大于全局熵,另一个小于全局熵),我们发现纠缠衰减速度不对称。当去极化通道作用于具有较小边缘熵的经典子系统时,这些态的纠缠减小得更快。

英文摘要:

A model of discrete dynamics of entanglement of bipartite quantum state is considered. It involves a global unitary dynamics of the system and periodic actions of local bistochastic or decaying channel. For initially pure states the decay of entanglement is accompanied with an increase of von Neumann entropy of the system. We observe and discuss revivals of entanglement due to unitary interaction of both subsystems. For some mixed states having different marginal entropies of both subsystems (one of them larger than the global entropy and the other one one smaller) we find an asymmetry in speed of entanglement decay. The entanglement of these states decreases faster, if the depolarizing channel acts on the "classical" subsystem, characterized by smaller marginal entropy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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