Systematic study of the PDC speckle structure for quantum imaging   applications
  Sub shot noise imaging of weak object by exploiting Parametric Down Converted light represents a very interesting technological development. A precise characterization of PDC speckle structure in dependence of pump beam parameters is a fundamental tool for this application. In this paper we present a first set of data addressed to this purpose. 
G.Brida, M.Genovese, A.Meda, E. Predazzi and I.Ruo-Berchera