Quantum test of the Universality of Free Fall using rubidium and potassium★
Leibniz Universität Hannover, Institut für Quantenoptik, Welfengarten 1, 30167 Hannover, Germany
2 College of Optical Sciences, University of Arizona, Tucson, AZ 85721, USA
3 ZARM Zentrum für angewandte Raumfahrttechnologie und Mikrogravitation, Universität Bremen, Am Fallturm 2, 28359 Bremen, Germany
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Received in final form: 22 May 2020
Published online: 7 July 2020
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.
© The Author(s) 2020. This article is published with open access at Springerlink.com
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