Testing the Universality of Free Fall by Comparing the Atoms in Different Hyperfine States with Bragg Diffraction  

作　　者：Ke Zhang Min-Kang Zhou Yuan Cheng Le-Le Chen Qin Luo Wen-Jie Xu Lu-Shuai Cao Xiao-Chun Duan Zhong-Kun Hu 张柯;周敏康;程源;陈乐乐;罗覃;徐文杰;曹鲁帅;段小春;胡忠坤(MOE Key Laboratory of Fundamental Physical Quantities Measurement&Hubei Key Laboratory of Gravitation and Quantum Physics,PGMF and School of Physics,Huazhong University of Science and Technology,Wuhan 430074)

机构地区：[1]MOE Key Laboratory of Fundamental Physical Quantities Measurement&Hubei Key Laboratory of Gravitation and Quantum Physics,PGMF and School of Physics,Huazhong University of Science and Technology,Wuhan 430074

出　　处：《Chinese Physics Letters》2020年第4期36-40,共5页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(Grant Nos.11625417,91636219,11727809,91736311,and 11922404).

摘　　要：We perform a precision atom interferometry experiment to test the universality of free fall.Our experiment employs the Bragg atom interferometer with 87Rb atoms either in hyperfine state|F=1,mF=0>or|F=2,mF=0>,and the wave packets in these two states are diffracted by one pair of Bragg beams alternatively,which is helpful for suppressing common-mode systematic errors.We obtain an Eotvos ratioη1-2=(0.9±2.7)×10^-10,and set a new record on the precision with improvement of nearly 5 times.This measurement also provides constraint on the difference of the diagonal terms of the mass-energy operator.

关 键 词：DIAGONAL constraint INTERFEROMETRY 

分 类 号：O562[理学—原子与分子物理]