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Light-shift induced by two unbalanced spontaneous decay rates in EIT (CPT) spectroscopies under Ramsey pulse excitation
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Xiaoyan Liu 《中国物理 B》2021,30(8):83203-083203
Light shift is important and inevitably affects the long-term stability of an atomic clock. In this work, considering two unbalanced branches of the spontaneous decay rate in a three-level system, we studied the frequency shifts of electromagnetically induced transparency (EIT) and coherent population trapping (CPT) clocks operating under the pulse sequence regime by numerically solving the Liouville density matrix equations. The results show that the frequency shifts are larger when the two branches of spontaneous emission rate are not equal compared to the equal case. In addition, in EIT-Ramsey, the effect of the unbalanced branches of the spontaneous decay rate and relaxations of low-energy states on the frequency shift is greater than that of Rabi frequency. In CPT-Ramsey, the relaxations of low-energy states play a dominant role in frequency shift. 相似文献
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2005年4月1日,我国的《电子签名法》开始实施。这是我国国民经济和社会信息化领域的第一部法律,也是《行政许可法》实施以来,以法律形式对直接关系公共利益的电子认证服务业设定行政许可,并授权信息产业部作为实施机关,对电子认证服务提供者实施监督管理的第一部法律。 相似文献
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为了提高油田开采的安全性和科学性,油田中装有各型数据传感器,但数据缺失导致传感器采集数据可用性显著降低。针对油田传感器大比例数据缺失填充问题,提出了一种基于多元回归KNN的缺失数据填充方法。该方法首先基于KNN利用传感器数据空间相关性预测缺失值,其次基于多元回归利用传感器数据时间相关性预测缺失值,最后将时空相关性预测结果通过样本决定系数进行整合。分别采用标准数据集和油田传感器数据集进行性能对比实验,结果验证了该方法对缺失数据填充的有效性和准确性。 相似文献
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