PT symmetry via electromagnetically induced transparency.
PT symmetry via electromagnetically induced transparency.
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DOI：
10.1364/oe.21.032053
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发表时间：
2013-07
期刊：
影响因子：
3.8
通讯作者：
Hui-jun Li;Jianpeng Dou;Guoxiang Huang
中科院分区：
文献类型：
--
作者：
Hui-jun Li;Jianpeng Dou;Guoxiang Huang
提出了一种利用电磁感应透明（EIT）实现宇称时间（PT）对称的方案。我们所考虑的系统是一个具有EIT核的冷四能级原子系综。研究表明，利用辅助光场的交叉相位调制、远失谐激光场的光学晶格势以及非相干泵浦光的光学增益，可以构造出一个PT对称的复光学势，用于探测光场的可控传输.与以往的研究相比，该方案只使用了一个原子种类，因此易于通过原子相干性实现PT对称哈密顿量。
We propose a scheme to realize parity-time (PT) symmetry via electromagnetically induced transparency (EIT). The system we consider is an ensemble of cold four-level atoms with an EIT core. We show that the cross-phase modulation contributed by an assisted field, the optical lattice potential provided by a far-detuned laser field, and the optical gain resulted from an incoherent pumping can be used to construct a PT-symmetric complex optical potential for probe field propagation in a controllable way. Comparing with previous study, the present scheme uses only a single atomic species and hence is easy for the physical realization of PT-symmetric Hamiltonian via atomic coherence.