Imaging spatio-temporal Hong-Ou-Mandel interference of bi-photon state of extremely high Schmidt number

• URL: http://arxiv.org/abs/2002.05690v3
• Date: Sun, 7 Jun 2020 13:13:07 GMT
• Title: Imaging spatio-temporal Hong-Ou-Mandel interference of bi-photon state of extremely high Schmidt number
• Authors: Fabrice Devaux, Alexis Mosset, Paul-Antoine Moreau, and Eric Lantz
• Abstract summary: Two-photon interference of 1500 spatial modes and a total of more than 3x106-temporal modes is measured. We show that the two-photon interference HOMs exhibit two-dimensional spatial visibilities of 30% and widths in good agreement with the temporal-dimensional coincidence properties of the bi-photon state.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We report the experimental observation of a spatio-temporal Hong-Ou-Mandel (HOM) interference of bi-photon states of extremely high Schmidt number. Two-photon interference of 1500 spatial modes and a total of more than 3x10^6 spatio-temporal modes is evidenced by measuring momentum spatial coincidences between the pixels of the far-field images of two strongly multimode spontaneous parametric down conversion (SPDC) beams propagating through a HOM interferometer. The outgoing SPDC beams are recorded onto two separate detectors arrays operating in the photon-counting regime. The properties of HOM interference are investigated both in the time and space domains. We show that the two-photon interferences exhibit temporal and two-dimensional spatial HOM dips with visibilities of 30% and widths in good agreement with the spatio-temporal coherence properties of the bi-photon state. Moreover, we demonstrate that a peak of momentum spatial coincidences is evidenced inside each image, in correspondence with this dip.

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