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

Author:

Sempere-Llagostera S.1,Thekkadath G. S.1ORCID,Patel R. B.12,Kolthammer W. S.1,Walmsley I. A.1ORCID

Affiliation:

1. Imperial College London

2. University of Oxford

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 of g(2)(τ = 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.

Funder

Engineering and Physical Sciences Research Council

National Research Council Canada

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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