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弱相干场原子-腔-光纤系统中的量子失协
Quantum discord in the system of two atoms trapp ed in weak coherent state cavities connected by an optical fib er
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摘要: 采用几何量子失协度量两个子系统间的关联，利用数值计算方法研究了原子-腔-光纤复合系统中两个原子之间和两个腔场之间的几何量子失协。讨论了腔场与光纤模间的耦合系数和弱相干场强度变化对几何量子失协的影响。研究结果表明：两原子之间和两腔场之间的几何量子失协均随时间作周期性演化，其演化频率随腔场与光纤模间的耦合系数增大而增大。另一方面，随弱相干场强度增大，两原子间和两腔场间的几何量子失协增大。这表明随弱相干场强度增大两原子间或两腔场间的关联增强。
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关键词:
- 量子光学 /
- 弱相干腔场 /
- 原子-腔-光纤复合系统 /
- 量子失协
Abstract: Geometrical quantum discord (GQD) is an effective measure of quantum correlation in quantum systems. We study GQD dynamics in an atom-cavity-fiber system. GQD between atoms and that between cavities are investigated. The influences of coupling constant between cavity and fiber and the intensity of the cavity field on GQD are discussed. Results show that GQD between atoms and that between cavities all display periodical evolutions, and their evolution frequencies increase with increasing coupling constant between cavity and fiber. On the other hand, the GQD between atoms and that between cavities are all strengthened with increasing intensity of the cavity field. -
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