双光子过程原子与耦合腔相互作用中的量子失协

The Quantum Discord in the System of Atoms Interacting with Coupled Cavities via a Two-photon Hopping Interaction

研究原子与耦合腔相互作用系统,考虑每个腔囚禁一个二能级原子,原子与腔场发生共振相互作用,腔场也相互耦合的情况;采用量子失协几何度量方法—几何量子失协,来度量两个子系统间的量子失协.利用数值计算方法给出了量子失协的演化曲线,讨论了腔场间耦合系数变化对量子失协的影响.研究结果表明:随腔场间耦合系数增大,两原子间量子失协增大,而原子与腔场间或两腔场间的量子失协却减小.

The cavity each imprisons one two-level atom,the atom has a resonant interaction with the cavities,and the cavities also interact with each other.Considering these,the geometrical quantum discord was used to measure quantum correlation in quantum systems.The geometrical quantum discord between the atoms,the cavities,and also between the atoms and the cavities were investigated.By using the numerical method,the evolution curves of the geometrical quantum discord were given,and the influences on the geometrical quantum discord with the changing coupling constant between the cavities were discussed.The results obtained show that the geometrical quantum discord between atoms is strengthened,but the geometrical quantum discord between cavities or between the atoms and the cavities are all weakened with the increasing of the coupling constant between cavities.