title: Measurement of sub-shot-noise correlations of spatial fluctuations in the photon-counting regime.
abstract: We have measured sub-shot-noise quantum correlations of spatial fluctuations in the far-field image of the parametric fluorescence created in a type I beta-barium-borate nonlinear crystal. Imaging is performed at very low light level (0.15 photons per pixel) with an electron multiplying charge coupled device camera. Experimental results overcome the standard quantum limit shot-noise level without subtraction of the variance of the detection noise.
authors.affiliation: Institut FEMTO-ST, Département d'Optique PM Duffieux, UMR CNRS-Université de Franche-Comté, No. 6174, Route de Gray, 25030 Besançon Cedex, France.
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Blanchet
authors.forename: Fabrice
authors.initials: F
authors.lastname: Devaux
authors.forename: Luca
authors.initials: L
authors.lastname: Furfaro
authors.forename: Eric
authors.initials: E
authors.lastname: Lantz