We simultaneously measure the gravitationally-induced phase shift in two Raman-type matter-wave interferometers operated with laser-cooled ensembles of ⁸⁷Rb and ³⁹K atoms. Our measurement yields an E\"otv\"os ratio of ηRb,K=(0.3± 5.4)× 10⁻⁷. We briefly estimate possible bias effects and present strategies for future improvements.
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Schlippert et al. (2014) studied this question.
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