Related papers: Second-order correlations and purity of unheralded single photons from spontaneous parametric down-conversion

Second-order correlations and purity of unheralded single photons from spontaneous parametric down-conversion

URL: http://arxiv.org/abs/2207.06984v1
Date: Thu, 14 Jul 2022 15:09:58 GMT
Title: Second-order correlations and purity of unheralded single photons from spontaneous parametric down-conversion
Authors: A. Padhye, K. Muhammed Shafi, C. M. Chandrashekar
Abstract summary: Various quantum technology applications require high-purity single photons with high generation rate. We present a revised expression to calculate second-order temporal correlation function, $g(2)$ for any fixed time window (bin)
Score: 1.7396274240172125
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Various quantum technology applications require high-purity single photons with high generation rate. Although different methods are employed to generate such photons, heralded single photons from spontaneous parametric down-conversion (SPDC) is the most commonly used approach. Photon generation rate from the heralded single-photon sources are limited by the efficiency of the detectors to record coincidence detection of the photon pairs which are lower than the single-photon counts recorded separately on each detector. In this paper we present a revised expression to calculate second-order temporal correlation function, $g^{(2)}$ for any fixed time window (bin) and report the experimental characterization of purity of unheralded and heralded single photons from the SPDC process. With an appropriate choice of time bin for a given pump power, without heralding we show that higher rate of single photons with $g^{(2)}(0) = 0$ can be generated with very high probability.

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