Entanglement evolution of two remote and non-identical Jaynes-Cummings atoms
Entanglement evolution of two remote and non-identical Jaynes-Cummings atoms
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DOI：
10.1088/0953-4075/42/6/065507
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发表时间：
2009-03-28
影响因子：
1.6
通讯作者：
Ficek, Z.
中科院分区：
文献类型：
--
作者：
Chan, Stanley;Reid, M. D.;Ficek, Z.
对两个相距遥远但不完全相同的系统的纠缠动力学进行了详细的处理。在双Jaynes-Cummings模型中，我们研究了两个远程原子与腔场独立相互作用时的纠缠演化。研究了四量子比特两两并发态，考虑了原子-腔场的非对称耦合和非共振相互作用。与直觉相反，不完美的匹配可能证明有利于纠缠的产生和演化。对于两种类型的初始纠缠，对应于自旋相关和反相关的Bell态Phi和Psi，对于共振相互作用，根据相对耦合的选择，完全、周期性和定向地将纠缠转移到特定的量子比特对是可能的。此外，使用非共振相互作用可以防止纠缠转移和猝死(ESD)，尽管对于一些初始态，失谐将触发否则冻结的纠缠，以允许完全纠缠转移。
A detailed treatment of the entanglement dynamics of two distant but non-identical systems is presented. We study the entanglement evolution of two remote atoms interacting independently with a cavity field, as in the double Jaynes-Cummings model. The four-qubit pairwise concurrences are studied, allowing for asymmetric atom-cavity couplings and off-resonant interactions. Counter to intuition, imperfect matching can prove advantageous to entanglement creation and evolution. For two types of initial entanglement, corresponding to spin-correlated and anti-correlated Bell states Phi and Psi, a full, periodic and directed transfer of entanglement into a specific qubit pair is possible, for resonant interactions, depending on the choice of relative couplings. Furthermore, entanglement transfer and sudden death (ESD) can be prevented using off-resonant interactions, although for some initial states, detunings will trigger an otherwise frozen entanglement, to allow a full entanglement transfer.