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We study the angular correlation function of speckle patterns that resultfrom multiple scattering of photons by cold atomic clouds. We show that thiscorrelation function becomes larger than the value given by Rayleigh law forclassical scatterers. These large intensity fluctuations constitute a newmesoscopic interference effect specific to atom-photon interactions, that couldnot be observed in other systems such as weakly disordered metals. We provide acomplete description of this behavior and expressions that allow for aquantitative comparison with experiments.Comment: 4 pages, 2 figure

Intensity Correlations and Mesoscopic Fluctuations of Diffusing Photons in Cold Atoms