Electromagnetic control and improvement of nonclassicality in a strongly coupled single-atom cavity-QED system

Electromagnetic control and improvement of nonclassicality in a strongly coupled single-atom cavity-QED system
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强耦合单原子腔QED系统中的电磁控制和非经典性改善

DOI:
10.1103/physreva.98.033828
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发表时间:
2018-09
期刊:
影响因子:
2.9
通讯作者:
Yang Ya-Ping
Yang Ya-Ping
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Han Yu-Feng;Zhu Cheng-Jie;Huang Xian-Shan;Yang Ya-Ping

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提出了一种控制和改善强耦合单原子腔-QED系统中光子非经典特性的方案,其中原子由外场直接驱动。通过研究系统的本征值和相应的本征态,我们证明了通过改变控制场强度可以对修饰态进行光学操控。特别地,通过调节控制场的频率使之与单光子激发态共振,我们证明了双光子阻塞产生的腔光子的非经典特性是可以主动控制的。我们还发现,存在一个魔术控制场的拉比频率,在这个频率下,双光子阻塞现象可以得到显着的改善。本文的工作提供了一种控制腔场统计特性的光学方法,可用于非经典光产生、光子网关操作和奇异量子态的产生。
We present a proposal to control and improve the nonclassicality of photons in a single-atom cavity-QED system with a strong coupling strength, where the atom is directly driven by external fields. Exploring the eigenvalues and the corresponding eigenstates of the system, we show that the dressed states can be optically manipulated by changing the control field intensity. In particular, tuning the control field frequency to be resonant with the one-photon excitation state, we show that the nonclassicality of cavity photons arising from the two-photon blockade can be actively controlled. We also show that there exists a magic control field Rabi frequency at which the two-photon blockade phenomenon can be significantly improved. The work presented here provides an optical method to control the statistical features of the cavity field that could find utility in nonclassical light generation, photon gateway operation, and exotic quantum-state generation.
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