Frequency multiplexing for quasi-deterministic heralded single-photon sources

Chaitali Joshi, Alessandro Farsi, Stéphane Clemmen, Sven Ramelow and Alexander L. Gaeta ()
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Chaitali Joshi: Columbia University
Alessandro Farsi: Columbia University
Stéphane Clemmen: Université Libre de Bruxelles
Sven Ramelow: Humboldt-Universität zu Berlin
Alexander L. Gaeta: Columbia University

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Parametric single-photon sources are well suited for large-scale quantum networks due to their potential for photonic integration. Active multiplexing of photons can overcome the intrinsically probabilistic nature of these sources, resulting in near-deterministic operation. However, previous implementations using spatial and temporal multiplexing scale unfavorably due to rapidly increasing switching losses. Here, we break this limitation via frequency multiplexing in which switching losses remain fixed irrespective of the number of multiplexed modes. We use low-noise optical frequency conversion for efficient frequency switching and demonstrate multiplexing of three modes. We achieve a generation rate of 4.6 × 104 photons per second with an ultra-low g(2)(0) = 0.07 indicating high single-photon purity. Our scalable, all-fiber multiplexing system has a total loss of just 1.3 dB, such that the 4.8 dB multiplexing enhancement markedly overcomes switching loss. Our approach offers a promising path to creating a deterministic photon source on an integrated chip-based platform.

Date: 2018
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DOI: 10.1038/s41467-018-03254-4

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