Macroscopic Hong–Ou–Mandel interference

We report on a Hong–Ou–Mandel interference experiment for twin beams with photon numbers per mode as large as 106 generated via high-gain parametric down conversion (PDC). The standard technique of coincidence counting leads in this case to a dip with a very low visibility. By measuring, instead of coincidence counting rate, the variance of the photon-number difference, we observe an extremely well-pronounced peak. From the shape of the peak, one can infer information about the spectral properties of the PDC radiation, including the number of frequency/temporal modes.

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