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

22 May 2020 · Albers H., Herbst A., Richardson L. L., Heine H., Nath D., Hartwig J., Schubert C., Vogt C., Woltmann M., Lämmerzahl C., Herrmann S., Ertmer W., Rasel E. M., Schlippert D. ·

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 E\"otv\"os ratio yields $\eta_{\,\text{Rb,K}}=-1.9\times10^{-7}$ with a combined standard uncertainty of $\sigma_\eta=3.2\times10^{-7}$.

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

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