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Quantum Test of the Universality of Free Fall Using Rubidium and Potassium

The European Physical Journal D(2020)

Leibniz Universität Hannover

Cited 30|Views44
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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