Reducing g(2)(0) of a parametric down-conversion source via photon-number resolution with superconducting nanowire detectors
Abstract
Multiphoton contributions pose a significant challenge for the realisation of heralded single-photon sources (HSPS) based on nonlinear processes. In this work, we improve the quality of single photons generated in this way by harnessing the photon-number resolving (PNR) capabilities of commercial superconducting nanowire single-photon detectors (SNSPDs). We report a 13 0.4 \% reduction in the intensity correlation function g(2)(0) even with a collection efficiency in the photon source of only 29.6\%. Our work demonstrates the first application of the PNR capabilities of SNSPDs and shows improvement in the quality of an HSPS with widely available technology.
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