Quantum test of the Universality of Free Fall using rubidium and potassium

By H. Albers, A. Herbst, L. Richardson, H. Heine, D. Nath, J. Hartwig, C. Schubert, C. Vogt, Marian Woltmann, C. Lämmerzahl and 4 more. European Physical Journal D : Atomic, Molecular and Optical Physics, 2020

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We report on an improved test of the Universality of Free Fall using a rubidium-potassium dual-species matter wave interferometer. We describe our apparatus and detail challenges and solutions relevant when operating a potassium interferometer, as well as systematic effects affecting our measurement. Our determination of the Eötvös ratio yields ηRb,K = −1.9 × 10−7 with a combined standard uncertainty of ση = 3.2 × 10−7.

Subfields: Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/2789167d7df3955e83e11a8d7ef2dfad154bb62e