New paper from the KRb lab published in Nature Communications:

Towards experimental quantum-field tomography with ultracold atoms
A. Steffens, M. Friesdorf, T. Langen, B. Rauer, T. Schweigler, R. Hübener, J. Schmiedmayer, C. A. Riofrío, J. Eisert
Nature Communications 6, 7663 (2015), arXiv:1406.3632

see also the press release