Ding Jiang-Hao, Huai Sai-Nan, Ian Hou, Liu Yu-Xi
Institute of Microelectronics, Tsinghua University, Beijing, 100084, China.
Institute of Applied Physics and Materials Engineering, University of Macau, 999078, Macau, China.
Sci Rep. 2018 Mar 14;8(1):4507. doi: 10.1038/s41598-018-22666-2.
We study the absorption spectrum of a probe field by a Λ-type three-level system, which is coupled to a quantized control field through the two upper energy levels. The probe field is applied to the ground and the second excited states. When the quantized control field is in vacuum, we derive a threshold condition to discern vacuum induced transparency (VIT) and vacuum induced Autler-Townes splitting (ATS). We also find that the parameter changing from VIT to vacuum induced ATS is very similar to that from broken PT symmetry to PT symmetry. Moreover, we find the photon number resolved spectrum in the parameter regime of vacuum induced ATS when the mean photon number of the quantized control field is changed from zero (vacuum) to a finite number. However, there is no photon number resolved spectrum in the parameter regime of VIT even that the quantized control field contains the finite number of photons. Finally, we further discuss possible experimental realization.
我们研究了一个Λ型三能级系统对探测场的吸收光谱，该系统通过两个高能级与一个量子化控制场耦合。探测场施加于基态和第二激发态。当量子化控制场处于真空时，我们推导了一个阈值条件来区分真空诱导透明（VIT）和真空诱导奥特勒 - 汤斯分裂（ATS）。我们还发现，从VIT到真空诱导ATS的参数变化与从PT对称性破缺到PT对称性的变化非常相似。此外，当量子化控制场的平均光子数从零（真空）变为有限数时，我们在真空诱导ATS的参数区域中找到了光子数分辨光谱。然而，即使量子化控制场包含有限数量的光子，在VIT的参数区域中也没有光子数分辨光谱。最后，我们进一步讨论了可能的实验实现。
