Nonlinear parametric interaction and higher-order squeezing in coherent population trapping
Nonlinear parametric interaction and higher-order squeezing in coherent population trapping
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DOI：
10.1209/0295-5075/108/54007
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发表时间：
2014-12
期刊：
影响因子：
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通讯作者：
Fei Wang;Xiangming Hu
中科院分区：
文献类型：
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作者：
Fei Wang;Xiangming Hu
本文证明了相干布居俘获（CPT）系统可以作为一个非线性参量相互作用过程，其中包含了高阶非线性效应，导致了非经典量子关联的发生。此外，我们的数值计算结果证实，单模和双模高阶压缩是可能的，在不同的条件下，由于高阶非线性效应，这是强烈决定的原子相干性。在CPT中得到的高阶压缩对耗散是鲁棒的，因为原子几乎被困在基态，这可能是有用的高精度测量。
In this paper, we show that coherent population trapping (CPT) system can act as a nonlinear parametric interaction process, in which higher-order nonlinear effects are included, giving rise to the occurrence of nonclassical quantum correlation. Furthermore, our numerical results confirm that single- and two-mode higher-order squeezing are possible to obtain under different conditions because of the higher-order nonlinear effects, which are strongly determined by the atomic coherence. The higher-order squeezing obtained in CPT is robust against dissipation since the atoms are nearly trapped into the ground state, which may be useful for high-precision measurement.