arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1902.09845physics.atom-phquant-ph
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laser频率涨落对里德堡相干衰减率的影响

Effect of laser frequency fluctuation on the decay rate of Rydberg coherence

Bongjune Kim, Ko-Tang Chen, Chia-Yu Hsu, Shih-Si Hsiao, Yu-Chih Tseng, Chin-Yuan Lee, Shih-Lun Liang, Yi-Hua Lai, Julius Ruseckas, Gediminas Juzeliunas, Ite A. Yu

摘要:

电磁感应透明(EIT)效应与里德伯态原子相结合,提供了高的光学非线性,有效地调解光子-光子相互作用。然而,里德伯相干的衰减率,即,退相干率在光学非线性效率中起重要作用,并且可以很大程度上受激光频率波动的影响。本文系统地研究了激光频率起伏对退相干率的影响。导出了一个定量描述退相干率与激光频率涨落关系的解析公式。利用激光冷却的$^{87}$ Rb原子的$Λ$型EIT系统对该公式进行了实验验证,该系统既可以完全消除激光频率涨落的影响,也可以可控地引入激光频率涨落的影响。在公式中还考虑了原子热运动引起的多普勒频移的影响,这种影响在$Λ$型EIT实验中可以忽略,但在Rydberg-EIT实验中是显著的。利用350个$μ$ K原子,研究了含有$|32D_{5/2}\rangle$态的Rydberg-EIT系统的退相干率.实验数据与公式的预测结果一致。我们能够在$2π\times$ 4.3 MHz的中等耦合拉比频率下实现相当低的$2π\times$ 48 kHz的退相干率。

英文摘要:

The effect of electromagnetically induced transparency (EIT) combined with Rydberg-state atoms provides high optical nonlinearity to efficiently mediate the photon-photon interaction. However, the decay rate of Rydberg coherence, i.e., the decoherence rate, plays an important role in optical nonlinear efficiency, and can be largely influenced by laser frequency fluctuation. In this work, we carried out a systematic study of the effect of laser frequency fluctuation on the decoherence rate. We derived an analytical formula that quantitatively describes the relationship between the decoherence rate and laser frequency fluctuation. The formula was experimentally verified by using the $Λ$-type EIT system of laser-cooled $^{87}$Rb atoms, in which one can either completely eliminate or controllably introduce the effect of laser frequency fluctuation. We also included the effect of Doppler shift caused by the atomic thermal motion in the formula, which can be negligible in the $Λ$-type EIT experiment but significant in the Rydberg-EIT experiment. Utilizing the atoms of 350 $μ$K, we studied the decoherence rate in the Rydberg-EIT system involving with the state of $|32D_{5/2}\rangle$. The experimental data are consistent with the predictions from the formula. We were able to achieve a rather low decoherence rate of $2π\times$48 kHz at a moderate coupling Rabi frequency of $2π\times$4.3 MHz.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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