Experimental test of quantum non-Gaussianity of heralded single photon   state
  We report on experimental verification of quantum non-Gaussianity of a heralded single photon state with positive Wigner function. We unambiguously demonstrate that the generated state cannot be expressed as a mixture of Gaussian states. A sufficient information to witness the quantum non-Gaussianity is obtained from a standard photon anti-correlation measurement. 
Miroslav Jezek, Ivo Straka, Michal Micuda, Miloslav Dusek, Jaromir   Fiurasek, Radim Filip
quant-ph