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Influence of Stark-shift on quantum coherence and non-classical correlations for two two-level atoms interacting with a single-mode cavity field
Physica A: Statistical Mechanics and its Applications ( IF 3.3 ) Pub Date : 2020-07-17 , DOI: 10.1016/j.physa.2020.124946
Abdallah Slaoui , Ahmed Salah , Mohammed Daoud

An exact analytic solution for two two-level atoms coupled with a multi-photon single-mode electromagnetic cavity field in the presence of the Stark shift is derived. We assume that the field is initially prepared in a coherent state and the two atoms are initially prepared in excited state. Considering the atomic level shifts generated by the Stark shift effect, the dynamical behavior of both quantum coherence (QC) measured using a quantum Jensen–Shannon divergence and of quantum correlations captured by quantum discord (QD) are investigated. It is shown that the intensity-dependent Stark-shift in the cavity and the number of coherent state photons plays a key role in enhancing or destroying both QC and QD during the process of intrinsic decoherence. We remarked that increasing the Stark-shift parameters, the frequencies of the transition for the mode of the cavity field, and photons number destroy both the amount of QC and QD and affected their periodicity. More importantly, QC and QD exhibit similar behavior and both show a revival phenomenon. We believe that the present work shows that the quantum information protocols based on physical resources in optical systems could be controlled by adjusting the Stark-shift parameters.



中文翻译:

斯塔克位移对与单模腔场相互作用的两个二能级原子的量子相干性和非经典相关性的影响

推导了在存在斯塔克位移的情况下,两个多能级原子与多光子单模电磁腔场耦合的精确解析解。我们假设电场最初以相干态准备,两个原子最初以激发态准备。考虑到由Stark位移效应产生的原子能级位移,研究了使用量子詹森-香农散度测量的量子相干(QC)和通过量子不和谐(QD)捕获的量子相关性的动力学行为。结果表明,腔内强度相关的斯塔克频移和相干态光子的数量在内在去相干过程中在增强或破坏QC和QD方面起着关键作用。我们说过,增加Stark-shift参数,腔场模式的跃迁频率和光子数会破坏QC和QD的数量并影响其周期性。更重要的是,QC和QD表现出相似的行为,并且都表现出复兴现象。我们认为,目前的工作表明,可以通过调节Stark位移参数来控制基于光学系统中物理资源的量子信息协议。

更新日期:2020-07-17
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