类W态原子与三耦合腔系统作用中的量子失协

Quantum Discord in The System of W-like States Atoms Interacting with Three Coupled Cavities Connected by Two Optical Fibers

研究了三个全同二能级原子与三耦合腔相互作用物理模型中两原子间的量子失协.腔与腔之间通过光纤耦合,考虑原子与腔模之间的共振作用,采用几何量子失协来度量两原子间的量子关联,数值计算了系统中两原子间的几何量子失协,给出了其演化曲线.讨论了光纤模与腔模间的耦合强度变化对几何量子失协的影响.结果表明:随光纤模与腔模间的耦合强度增大,两原子间的几何量子失协增大,即两原子间量子关联增强.

The Geometrical Quantum Discord （GQD） is an effective measure of quantum correlation in quantum systems. The system of W-like states atoms interacting with three coupled cavities connected by two optical fibers was investigated. In the case of like-W state, optical cavities and fiber field are all in vacuum state initially. The evolution of the state vector of the system is given. GQD is adopted to quantify the degree of quantum discord between atoms. The GQD dynamics between atoms are discussed. The influences of coupling constant between c^vity and fiber on geometrical quantum discord between atoms are discussed. The results show that GQD between atoms is strengthened with increasing of coupling constant between cavity and fiber.