Reducing $g^{(2)}(0)$ of a parametric down-conversion source via photon-number resolution with superconducting nanowire detectors

• URL: http://arxiv.org/abs/2111.15308v1
• Date: Tue, 30 Nov 2021 11:43:03 GMT
• Title: Reducing $g^{(2)}(0)$ of a parametric down-conversion source via photon-number resolution with superconducting nanowire detectors
• Authors: S. Sempere-Llagostera, G. S. Thekkadath, R. B. Patel, W. S. Kolthammer, I. A. Walmsley
• Abstract summary: We harness the photon-number resolving capabilities of commercial superconducting nanowire single-photon detectors (SNSPDs) 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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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 $13 \pm 0.4 \%$ 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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