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耦合腔系统中的三体纠缠演化
The evolution of three-body entanglement in the system of atoms interacting with coupled cavities*
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摘要: 研究由耦合腔和四个全同的二能级原子构成的系统中三体纠缠态纠缠量的演化．四个原子分别囚禁在单模耦合腔A和B中，并且原子通过单光子跃迁与腔场发生共振相互作用．采用纠缠张量方法，通过数值计算研究了每个腔中三体纠缠的演化．讨论了原子与腔场间的耦合强度对三体纠缠演化的影响．研究结果表明：原子与腔场问的两体纠缠强于原子间的两体纠缠，每个腔中的三体纠缠是两体纠缠相干叠加的结果．Abstract: In this paper we consider the situation that four identical two-level atoms are separately trapped in coupled single-mode optical cavities and each atom resonantly interacts with cavity via a one-photon hopping. The three-body entanglement dynamics in each cavity is studied. The influences of atom-cavity coupling constant on the three-body entanglement are discussed. The results obtained using the numerical method show that the three-body entanglement displays the collapse-revival phenomena when atom-cavity coupling constant is larger than a fixed value. On the other hand, the three-body entanglement is the result of the coherent superposition of the two-body entanglements.
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