Test of the Universality of Free Fall with Atoms in Different Spin Orientations.

  title={Test of the Universality of Free Fall with Atoms in Different Spin Orientations.},
  author={Xiao-chun Duan and Xiao-Bing Deng and Min-Kang Zhou and Ke Zhang and Wenlan Xu and Feng Xiong and Yao-Yao Xu and Cheng-Gang Shao and Jun Luo and Zhongkun Hu},
  journal={Physical review letters},
  volume={117 2},
We report a test of the universality of free fall by comparing the gravity acceleration of the ^{87}Rb atoms in m_{F}=+1 versus those in m_{F}=-1, of which the corresponding spin orientations are opposite. A Mach-Zehnder-type atom interferometer is exploited to alternately measure the free fall acceleration of the atoms in these two magnetic sublevels, and the resultant Eötvös ratio is η_{S}=(0.2±1.2)×10^{-7}. This also gives an upper limit of 5.4×10^{-6}  m^{-2} for a possible gradient field… 

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