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Test of Equivalence Principle at $10^{-8}$ Level by a Dual-species Double-diffraction Raman Atom Interferometer (1503.00401v1)
Published 2 Mar 2015 in physics.atom-ph and gr-qc
Abstract: We report an improved test of the weak equivalence principle by using a simultaneous ${85}$Rb-${87}$Rb 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 E\"{o}tv\"{o}s parameter $\eta$ is $0.8\times10{-8}$ at 3200 s. With various systematic errors corrected the final value is $\eta=(2.8\pm3.0)\times10{-8}$. The major uncertainty is attributed to the Coriolis effect.