Pulsed squeezed vacuum characterization without homodyning
  Direct photon detection is experimentally implemented to measure the squeezing and purity of a single-mode squeezed vacuum state without an interferometric homodyne detection. Following a recent theoretical proposal [arXiv quant-ph/0311119], the setup only requires a tunable beamsplitter and a single-photon detector to fully characterize the generated Gaussian states. The experimental implementation of this procedure is discussed and compared with other reference methods. 
J. Wenger, J. Fiurasek, R. Tualle-Brouri, N.J. Cerf and Ph. Grangier