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Spatial coherence of light in the two-photon state

Summary form only given. We present experimental results of the Young's double-slit interference pattern of light in the two-photon state. By doing Young's interference experiments with the output light of a Hong-Ou-Mandel (H-O-M) interferometer, we are able to study the spatial coherence properties of the light in the two photon state (two photons in the same wave packet).