Experimental study of the spatial distribution of quantum correlations   in a confocal Optical Parametric Oscillator
  We study experimentally the spatial distribution of quantum noise in the twin beams produced by a type II Optical Parametric Oscillator operating in a confocal cavity above threshold. The measured intensity correlations are at the same time below the standard quantum limit and not uniformly distributed inside the beams. We show that this feature is an unambiguous evidence for the multimode and nonclassical character of the quantum state generated by the device. 
Marcello Martinelli, Nicolas Treps, Sara Ducci, Sylvain Gigan, Agnes   Maitre and Claude Fabre (Laboratoire Kastler Brossel,...