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The permanent electric dipole moment (EDM) of the 171Yb atom is measured with atoms held in an optical dipole trap (ODT) [Zheng et al., PRL (2022)]. By enabling a cycling transition that is simultaneously spin-selective and spin-preserving, a QND measurement with a spin-state-detection efficiency of 50% is realized [Yang et al., PRApp (2023)]. A systematic effect due to parity mixing induced by a static E-field is observed, and is suppressed by averaging between measurements with ODTs in opposite directions. The coherent spin precession time is found to be much longer than 300 s. An upper limit on the EDM is determined to be on the order of 10-27 e·cm. Meanwhile, a 171Yb – 173Yb co-magnetometer is under development in preparation for the next-generation measurements [Yang et al., Nat Photon (2024)]. These measurement techniques can be adapted to search for the EDM of 225Ra.
This work is supported by the Chinese Ministry of Science and Technology, National Natural Science Foundation of China, and the Chinese Academy of Sciences.
