Narrowband Biphoton Generation with Four-Wave Mixing in a Far-Detuning Three-Level System
Narrowband Biphoton Generation with Four-Wave Mixing in a Far-Detuning Three-Level System
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DOI：
10.1088/0256-307x/28/7/074214
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发表时间：
2011-07
影响因子：
3.5
通讯作者：
Peng Chen;Shuyu Zhou;Zhen Xu;Yafan Duan;Guodong Cui;T. Hong;Yu-zhu Wang
中科院分区：
文献类型：
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作者：
Peng Chen;Shuyu Zhou;Zhen Xu;Yafan Duan;Guodong Cui;T. Hong;Yu-zhu Wang
在大失谐三能级冷原子系统中，通过四波混频过程产生了非经典成对光子。观察到一个310倍的柯西-施瓦茨不等式的违反。这一现象表明，成对光子之间存在非经典关联。实验结果与微扰理论得到的理论结果进行了比较。双光子强度关联函数的振荡频率与耦合激光的有效拉比频率相当一致。然而，我们发现观测到的退相率（或衰变率）远大于理论值。
Non-classical paired photons are generated by a four-wave mixing process in a far-detuning three-level system with cold atoms. A violation of the Cauchy-Schwartz inequality of a factor of 310 is observed. This phenomenon shows that paired photons have a non-classical correlation. The experimental results are compared with theoretical results obtained using perturbation theory. The oscillation frequencies of the two-photon intensity correlation functions are in reasonable agreement with the effective Rabi frequencies of the coupling laser. However, we find that the dephasing rates (or decay rates) observed are far larger than the theoretical values.