To evidence multimode spatial entanglement of spontaneous down-conversion,detector arrays allow a full field measurement, without any a priori selectionof the paired photons. We show by comparing results of the recent literaturethat electron-multiplying CCD (EMCCD) cameras allow, in the present state oftechnology, the detection of quantum correlations with the best signal-to-noiseratio (SNR), while intensified CCD (ICCD) cameras allow at best to identifypairs. The SNR appears to be proportional to the square root of the number ofcoherence cells in each image, or Schmidt number. Then, corrected estimates arederived for extended coherence cells and not very low and not space-stationaryphoton fluxes. Finally, experimental measurements of the SNR confirm our model.
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