论文标题
测量电子偶极矩的新技术
New techniques for a measurement of the electron's electric dipole moment
论文作者
论文摘要
电子（EEDM）的电偶极矩可以使用重的极性分子高精度测量。在本文中，我们报告了一系列新技术，这些技术提高了YBF EEDM实验的统计灵敏度。我们使用经过精心设计的光学泵送方案通过数量级来增加参与实验的分子数量。我们还使用光循环方案提高了这些分子的检测效率。此外，我们还展示了如何破坏黑暗状态并减少限制这些技术效率的背景。这些改进共同使我们能够证明统计灵敏度为$ 1.8 \ times 10^{ - 28} $ e cm之后，在测量一天之后，这是射击噪声限制的1.2倍。这里介绍的技术适用于使用分子的其他高精度测量。
The electric dipole moment of the electron (eEDM) can be measured with high precision using heavy polar molecules. In this paper, we report on a series of new techniques that have improved the statistical sensitivity of the YbF eEDM experiment. We increase the number of molecules participating in the experiment by an order of magnitude using a carefully designed optical pumping scheme. We also increase the detection efficiency of these molecules by another order of magnitude using an optical cycling scheme. In addition, we show how to destabilise dark states and reduce backgrounds that otherwise limit the efficiency of these techniques. Together, these improvements allow us to demonstrate a statistical sensitivity of $1.8 \times 10^{-28}$ e cm after one day of measurement, which is 1.2 times the shot-noise limit. The techniques presented here are applicable to other high-precision measurements using molecules.
