%0 Journal Article
%T Quantum Test of the Universality of Free Fall
%A Dennis Schlippert
%A Jonas Hartwig
%A Henning Albers
%A Logan L. Richardson
%A Christian Schubert
%A Albert Roura
%A Wolfgang P. Schleich
%A Wolfgang Ertmer
%A Ernst M. Rasel
%J Physics
%D 2014
%I arXiv
%R 10.1103/PhysRevLett.112.203002
%X We simultaneously measure the gravitationally-induced phase shift in two Raman-type matter-wave interferometers operated with laser-cooled ensembles of $^{87}$Rb and $^{39}$K atoms. Our measurement yields an E\"otv\"os ratio of $\eta_{\text{Rb,K}}=(0.3\pm 5.4)\times 10^{-7}$. We briefly estimate possible bias effects and present strategies for future improvements.
%U http://arxiv.org/abs/1406.4979v1