Measuring the Schmidt number of parametric down conversion by exploiting photon distribution

Lior Cohen, Elisha S. Matekole, Yehuda Pilnyak, Daniel Istrati, Jonathan P. Dowling, Hagai S. Eisenberg

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The Schmidt number quantifies the number of modes and is mainly used as a measure for the quality of entanglement. We theoretically compute the photon distribution of type-I spontaneous parametric down conversion (SPDC) with an arbitrary Schmidt number. The photon distribution is used for a novel method to measure the Schmidt number. This method requires only two on-off single-photon detectors with no photon number or temporal resolution. The method works in the strong pumping regime where high photon numbers are non-negligible. We experimentally demonstrate the method for type-II SPDC. The easy and fast measurement of the Schmidt number has a broad range of applications from the calibration of strong pump SPDC and entanglement sources to multi-photon quantum interference and Gaussian boson sampling.

Original languageAmerican English
Article number025002
JournalAVS Quantum Science
Issue number2
StatePublished - 1 Jun 2023

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