Spatial coherence effects on second- and fourth-order temporal interference

Details Spatial coherence effects on second- and fourth-order temporal interference Spatial coherence effects on second- and fourth-order temporal interference

2008-05-06

arxiv.org/abs/0805.0641v1

Opt. Express 16, 7634-7640 (May 2008)

Physics

Quantum Physics

Scientific paper

10.1364/OE.16.007634

We report the results of two experiments performed with two-photon light, produced via collinear degenerate optical spontaneous parametric downconversion (SPDC), in which both second-order (one-photon) and fourth-order (two-photon) interferograms are recorded in a Mach-Zehnder interferometer (MZI). In the first experiment, high-visibility fringes are obtained for both the second- and fourth-order interferograms. In the second experiment, the MZI is modified by the removal of a mirror from one of its arms; this leaves the fourth-order interferogram unchanged, but extinguishes the second-order interferogram. A theoretical model that takes into consideration both the temporal and spatial degrees-of-freedom of the two-photon state successfully explains the results. While the temporal interference in the MZI is independent of the spatial coherence of the source, that of the modified MZI is not.

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