Quantum Test of the Universality of Free Fall Using Rubidium and Potassium
The European Physical Journal D(2020)
Leibniz Universität Hannover
Abstract
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 η Rb,K = −1.9 × 10 −7 with a combined standard uncertainty of σ η = 3.2 × 10 −7 . Graphical abstract
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