Test of Equivalence Principle at 10(-8) Level by a Dual-Species Double-Diffraction Raman Atom Interferometer

• Published in: Physical review letters Vol. 115; no. 1; p. 013004
• Main Authors: Zhou, Lin, Long, Shitong, Tang, Biao, Chen, Xi, Gao, Fen, Peng, Wencui, Duan, Weitao, Zhong, Jiaqi, Xiong, Zongyuan, Wang, Jin, Zhang, Yuanzhong, Zhan, Mingsheng
• Format: Journal Article
• Language: English
• Published: United States 03.07.2015
• ISSN: 1079-7114
• DOI: 10.1103/PhysRevLett.115.013004

We report an improved test of the weak equivalence principle by using a simultaneous 85Rb-87Rb dual-species atom interferometer. We propose and implement a four-wave double-diffraction Raman transition scheme for the interferometer, and demonstrate its ability in suppressing common-mode phase noise of Raman lasers after their frequencies and intensity ratios are optimized. The statistical uncertainty of the experimental data for Eötvös parameter η is 0.8×10(-8) at 3200 s. With various systematic errors corrected, the final value is η=(2.8±3.0)×10(-8). The major uncertainty is attributed to the Coriolis effect.