Zheng T A, Yang Y A, Wang S-Z, Singh J T, Xiong Z-X, Xia T, Lu Z-T
CAS Center for Excellence in Quantum Information and Quantum Physics, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China.
National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
Phys Rev Lett. 2022 Aug 19;129(8):083001. doi: 10.1103/PhysRevLett.129.083001.
The permanent electric dipole moment (EDM) of the ^{171}Yb (I=1/2) atom is measured with atoms held in an optical dipole trap. By enabling a cycling transition that is simultaneously spin-selective and spin-preserving, a quantum nondemolition measurement with a spin-detection efficiency of 50% is realized. A systematic effect due to parity mixing induced by a static E field is observed, and is suppressed by averaging between measurements with optical dipole traps in opposite directions. The coherent spin precession time is found to be much longer than 300 s. The EDM is determined to be d(^{171}Yb)=(-6.8±5.1_{stat}±1.2_{syst})×10^{-27} e cm, leading to an upper limit of |d(^{171}Yb)|<1.5×10^{-26} e cm (95% C.L.). These measurement techniques can be adapted to search for the EDM of ^{225}Ra.
利用被囚禁在光偶极阱中的原子测量了(^{171}Yb)（(I = 1/2)）原子的永久电偶极矩（EDM）。通过启用一个同时具有自旋选择性和自旋保持性的循环跃迁，实现了自旋检测效率为50%的量子无损测量。观测到了由静态电场引起的宇称混合导致的系统效应，并通过对相反方向光偶极阱测量结果进行平均来抑制该效应。发现相干自旋进动时间远长于300秒。确定电偶极矩为(d(^{171}Yb)=(-6.8±5.1_{统计}±1.2_{系统})×10^{-27}) (e) (cm)，得出(|d(^{171}Yb)|<1.5×10^{-26}) (e) (cm)（95%置信水平）的上限。这些测量技术可用于搜索(^{2^{25}}Ra)的电偶极矩。
