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Spontaneous downconversion is a versatile source for correlated biphotonsthat has been employed in many quantum sensing and imaging experiments.Spatially-resolved photon-counting detectors allow to access a large number ofmodes, posing the challenge of an accurate description of such systems. Wepropose a simple model to generate images as though acquired by aphoton-counting camera, and allow to simulate and characterise the detection ofquantum correlations. We derive quantitative parameters characteristic of thespatial correlations for a given experiment, comparing the images produced byour model to the frames acquired by an electron-multiplying CCD camera.Moreover we accurately predict the decreased detection of spatially correlatedbiphotons caused by introducing a variable amount of optical loss after thenonlinear crystal, even though the total number of detected events is keptconstant, showing excellent agreement between model and experiment.

A model for the detection of spatially correlated biphotons using a photon-counting camera