We investigated the propagation of a squeezed optical field, generated via the polarization self-rotation effect, with a sinusoidally modulated degree of squeezing through an atomic medium with anomalous dispersion. We observed the advancement of the signal propagating through a resonant Rb vapor compared to the reference signal, propagating in air. The measured advancement time grew linearly with atomic density, reaching a maximum of 11 ± 1 μs, which corresponded to a negative group velocity of v_g ≈ -7,000 m/s. We also confirmed that the increasing advancement was accompanied by a reduction of output squeezing levels due to optical losses, in good agreement with theoretical predictions.
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机译：我们研究了通过偏振自旋效应产生的压缩光场的传播，其中正弦调制度压缩通过具有异常色散的原子介质。与在空气中传播的参考信号相比，我们观察到通过共振Rb蒸气传播的信号的进展。测得的推进时间随原子密度线性增长，最大达到11±1μs，对应于负群速度v_g≈-7,000 m / s。我们还证实，随着光学损耗的增加，输出的压缩水平也随之降低，这与理论预测相吻合。
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