New paper from the Rb2 experiment published in Nature Communications:

Interferometry with non-classical motional states of a Bose-Einstein condensate
S. van Frank, A. Negretti, T. Berrada, R. Bücker, S. Montangero, J.-F. Schaff, T. Schumm, T. calarco, J. Schmiedmayer
Nature Communications 5, 4009
TU press release