Quantum 2.0 Conference and Exhibition

Reducing g(2)(0) of a Parametric Down-Conversion Source via Photon-Number Resolution with Superconducting Nanowire Detectors

S. Sempere-Llagostera, Guillaume Thekkadath, Raj B. Patel, W. S. Kolthammer, Ian A. Walmsley

Published Jan 1, 2022• 1 citation

Abstract

We demonstrate a 13 ± 0.4% reduction of the second-order correlation function g(2)(0) by harnessing the photon-number resolving capabilities of commercial super-conducting nanowire single-photon detectors, improving the quality of a heralded single-photon source.

DOI: 10.1364/quantum.2022.qw3b.6

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Reducing g(2)(0) of a Parametric Down-Conversion Source via Photon-Number Resolution with Superconducting Nanowire Detectors

S. Sempere-Llagostera, Guillaume Thekkadath, Raj B. Patel, W. S. Kolthammer, Ian A. Walmsley

Published Jan 1, 2022• 1 citation

Publisher

Abstract

DOI: 10.1364/quantum.2022.qw3b.6

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{g}^{2}(0)

measurement of the signal mode conditioned on the measured photon number of the idler mode for various pump powers and demonstrate an improvement of a heralded single-photon source. We develop an analytical model using a phase-space formalism that encompasses all multiphoton effects and relevant imperfections, such as loss and multiple Schmidt modes. We perform a maximum-likelihood fit to test the agreement of the model to the data and extract the best-fit mean photon number $\ensuremath{\mu}$ of the pair source for each pump power. A maximum reduction of $0.118\ifmmode\pm\else\textpm\fi{}0.012$ in the photon

{g}^{2}(0)

correlation function at $\ensuremath{\mu}=0.327\ifmmode\pm\else\textpm\fi{}0.007$ is obtained, indicating a strong suppression of multiphoton emissions. For a fixed ${g}^{2}(0)=7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, we increase the single pair generation probability by 25%. Our experiment, built using fiber-coupled and off-the-shelf components, delineates a path to engineering ideal sources of single photons.