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原子与耦合腔相互作用系统中的量子失协
Quantum discord in the system of atoms interacting with coupled cavities
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摘要: 本文研究由两个全同的二能级原子和耦合腔构成的系统，利用Dakic等提出的几何量子失协的度量方法，采用数值计算方法计算了系统中两原子间和两腔场间量子失协的演化。讨论了原子间初始纠缠度和腔场间耦合系数变化对几何量子失协演化的影响。研究发现：随腔场间耦合系数的增大，量子失协周期性演化的频率增大；随原子间初始纠缠度的增大，两原子间的关联增强，两腔场间的关联减弱。Abstract: The geometrical quantum discord (GQD) is an effective measure of quantum correlation in quantum systems. We have studied GQD dynamics of the system comprising two two-level atoms resonantly interacting with two coupled cavities. GQD between atoms and that between cavities are investigated. The influences of coupling constant between cavities and initial entanglement between atoms on GQD are discussed. Results obtained using a numerical method show that GQD between atoms is strengthened, and GQD between cavities is weakened with increasing initial entanglement between atoms. On the other hand, the evolution regularity of GQD between atoms and that between cavities are all strengthened with increasing coupling constant between cavities.
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