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arXiv 1502.00332quant-ph
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减慢双-双电磁感应透明第二窗口中的探测场

Slowing the probe field in the second window of double-double electromagnetically induced transparency

Hessa M. Alotaibi, Barry C. Sanders

摘要:

对于双-双电磁感应透明(EIT)条件下的多普勒展宽介质,我们设计了一种方案来控制和降低第二透明窗口中心的探测场群速度。我们推导出数值和近似的解析解的EIT窗口的宽度和探测场的群速度在两个不同的透明窗口,我们表明,探测场的群速度可以通过明智地选择系统的物理参数降低。我们的建模使我们能够确定三个信号场强度制度(与信号场强度总是高于探测场强度),量化的拉比频率,用于减缓探测场。这三种状态对应于弱信号场,其中与第一窗口相比,第二窗口的探测场群速度和透明窗口宽度都较小,中等强度信号场,其中第二窗口中的探测场群速度小于第一窗口中的探测场群速度,但是第二窗口的透明窗口宽度较大,以及强信号场,对于第二窗口,群速度和透明窗口宽度都较大。我们的方案利用了这样一个事实,即第二个透明窗口是敏感的温度控制的信号场的非线性,而第一个透明窗口是不敏感的这种非线性。

英文摘要:

For Doppler-broadened media operating under double-double electromagnetically induced transparency (EIT) conditions, we devise a scheme to control and reduce the probe-field group velocity at the center of the second transparency window. We derive numerical and approximate analytical solutions for the width of EIT windows and for the group velocities of the probe field at the two distinct transparency windows, and we show that the group velocities of the probe field can be lowered by judiciously choosing the physical parameters of the system. Our modeling enables us to identify three signal-field strength regimes (with a signal-field strength always higher than the probe-field strength), quantified by the Rabi frequency, for slowing the probe field. These three regimes correspond to a weak signal field, with the probe-field group velocity and transparency window width both smaller for the second window compared to the first window, a medium-strength signal field, with a probe-field group velocity smaller in the second window than in the first window but with larger transparency-window width for the second window, and the strong signal field, with both group velocity and transparency window width larger for the second window. Our scheme exploits the fact that the second transparency window is sensitive to a temperature-controlled signal-field nonlinearity, whereas the first transparency window is insensitive to this nonlinearity.

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