Measurement of two-mode squeezing with photon number resolving   multi-pixel detectors
  The measurement of the two-mode squeezed vacuum generated in an optical parametric amplifier (OPA) was performed with photon number resolving Multi-Pixel Photon Counters (MPPCs). Implementation of the MPPCs allows for the observation of noise reduction in a broad dynamic range of the OPA gain, which is inaccessible with standard single photon avalanche photodetectors. 
Dmitry A. Kalashnikov, Si-Hui Tan, Timur Sh. Iskhakov, Maria V.   Chekhova, Leonid A. Krivitsky
quant-ph