Local sampling of the Wigner function at telecom wavelength with   loss-tolerant detection of photon statistics
  We report the experimental point-by-point sampling of the Wigner function for nonclassical states created in an ultrafast pulsed type-II parametric down-conversion source. We use a loss-tolerant time-multiplexed detector based on a fiber-optical setup and a pair of photon-number-resolving avalanche photodiodes. By capitalizing on an expedient data-pattern tomography, we assess the properties of the light states with outstanding accuracy. The method allows us to reliably infer the squeezing of genuine two-mode states without any phase reference. 
G. Harder, Ch. Silberhorn, J. Rehacek, Z. Hradil, L. Motka, B.   Stoklasa, L. L. Sanchez-Soto
quant-ph