Joint multipartite photon statistics by on/off detection
  We demonstrate a method to reconstruct the joint photon statistics of two or more modes of radiation using on/off photodetection performed at different quantum efficiencies. The two-mode case is discussed in details and experimental results are presented for the bipartite states obtained after a beam-splitter fed by a single photon state or a thermal state. 
G. Brida, M. Genovese, M. G. A. Paris, F.Piacentini