Chin. Phys. Lett.  2020, Vol. 37 Issue (4): 043701    DOI: 10.1088/0256-307X/37/4/043701
Testing the Universality of Free Fall by Comparing the Atoms in Different Hyperfine States with Bragg Diffraction
Ke Zhang, Min-Kang Zhou**, Yuan Cheng, Le-Le Chen, Qin Luo, Wen-Jie Xu, Lu-Shuai Cao, Xiao-Chun Duan, Zhong-Kun Hu**
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
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Ke Zhang, Min-Kang Zhou, Yuan Cheng et al  2020 Chin. Phys. Lett. 37 043701
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Abstract We perform a precision atom interferometry experiment to test the universality of free fall. Our experiment employs the Bragg atom interferometer with $^{87}$Rb atoms either in hyperfine state $\left| {F = 1,{m_F} = 0} \right\rangle $ or $\left| {F = 2,{m_F} = 0} \right\rangle $, 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 Eötvös ratio ${\eta_{1 - 2}} = \left({ 0.9 \pm 2.7} \right) \times {10^{- 10}}$, 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.
Received: 06 December 2019      Published: 24 March 2020
PACS:  37.25.+k (Atom interferometry techniques)  
  03.75.Dg (Atom and neutron interferometry)  
  04.80.Cc (Experimental tests of gravitational theories)  
Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11625417, 91636219, 11727809, 91736311, and 11922404).
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Ke Zhang
Min-Kang Zhou
Yuan Cheng
Le-Le Chen
Qin Luo
Wen-Jie Xu
Lu-Shuai Cao
Xiao-Chun Duan
Zhong-Kun Hu
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