Abstract

The permanent electric dipole moment (EDM) of atoms, molecules, and elementary particles is predicted in the standard model. While it is too small compared with the experimental measurement sensitivity, it is an important method to search for beyond-standard-model physics via CP violating mechanisms. In our work, EDM of the¹⁷¹Yb atoms is measured with atoms held in an optical dipole trap. 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 measurement result leads to an upper limit of |d(¹⁷¹Yb)| < 1.5 × 10^-26e cm (95% C.L.). These measurement techniques can be adapted to search for the EDM of²²⁵Ra。

Biography

夏添，现任中国科学技术大学合肥微尺度物质科学国家研究中心副研究员。本科毕业于清华大学；在普林斯顿大学博士学位，期间主要研究气室内热原子超极化。之后年在威斯康辛大学麦迪逊分校任博士后；期间研究课题为基于二维光晶格原子阵列的量子计算。2015年至今在中国科学技术大学主要从事量子精密测量工作，专注于基于冷原子方法测量逆磁性原子固有电偶极矩并寻找标准模型外的新物理。