Asenbaum Peter, Overstreet Chris, Kim Minjeong, Curti Joseph, Kasevich Mark A
Department of Physics, Stanford University, Stanford, California 94305, USA.
Phys Rev Lett. 2020 Nov 6;125(19):191101. doi: 10.1103/PhysRevLett.125.191101.
We use a dual-species atom interferometer with 2 s of free-fall time to measure the relative acceleration between ^{85}Rb and ^{87}Rb wave packets in the Earth's gravitational field. Systematic errors arising from kinematic differences between the isotopes are suppressed by calibrating the angles and frequencies of the interferometry beams. We find an Eötvös parameter of η=[1.6±1.8(stat)±3.4(syst)]×10^{-12}, consistent with zero violation of the equivalence principle. With a resolution of up to 1.4×10^{-11} g per shot, we demonstrate a sensitivity to η of 5.4×10^{-11}/sqrt[Hz].
我们使用具有2秒自由落体时间的双物种原子干涉仪来测量地球引力场中(^{85}Rb)和(^{87}Rb)波包之间的相对加速度。通过校准干涉测量光束的角度和频率，抑制了由同位素之间的运动学差异引起的系统误差。我们发现厄缶参数(\eta = [1.6\pm1.8(统计)\pm3.4(系统)]×10^{-12})，与等效原理零违反一致。单次测量分辨率高达(1.4×10^{-11}g)，我们展示了对(\eta)的灵敏度为(5.4×10^{-11}/\sqrt{Hz})。
