腔QED开放系统中的三分量子态映射和非连续纠缠转移
Tripartite quantum state mapping and discontinuous entanglement transfer in a cavity QED open system
摘要：
我们描述了量子信息和纠缠从三个飞行（辐射）到三个本地化（原子）量子比特通过腔模共振耦合到原子，在一个共同的水库的存在。在解决由此产生的九量子比特开放系统的完整动力学时，我们发现，一旦腔被馈送，保真度和转移纠缠是最佳的，而它们的峰值由于耗散过程而呈指数下降。然后关闭外部辐射，量子关联在原子和腔量子比特之间振荡。对于一类W和GHZ输入态的混合系统，我们研究了子系统间纠缠的不连续交换，解决了多体系统中纠缠的突然死亡和出生问题.
英文摘要：
We describe the transfer of quantum information and entanglement from three flying (radiation) to three localized (atomic) qubits via cavity modes resonantly coupled to the atoms, in the presence of a common reservoir. Upon addressing the full dynamics of the resulting nine-qubit open system, we find that once the cavities are fed, fidelity and transferred entanglement are optimal, while their peak values exponentially decrease due to dissipative processes. The external radiation is then turned off and quantum correlations oscillate between atomic and cavity qubits. For a class of mixtures of W and GHZ input states we deal with a discontinuous exchange of entanglement among the subsystems, facing the still open problem of entanglement sudden death and birth in a multipartite system.
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