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We present an all-fibre source of high-purity heralded single photons with an integrated conditional optical gate that reduces uncorrelated noise by almost an order of magnitude. Generating photon pairs by four-wave mixing in photonic crystal fibre, we observe with the noise gate active a factor of 7 reduction in the rate of single counts in the heralded channel with no measurable drop in coincidence count rate. In contrast to electronic post-selection of coincidence events, the real reduction in the flux of unwanted photons is beneficial for example to avoid bleaching light-sensitive samples or in generating entangled states.
|Number of pages||5|
|Journal||Journal of Optics|
|Early online date||25 Aug 2017|
|Publication status||Published - 19 Sept 2017|
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- 1 Finished
Unlocking the Potential of Fibre-Based Single-Photon Sources
Engineering and Physical Sciences Research Council
17/05/13 → 16/05/15
Project: Research council
Dataset for Fibre-integrated noise gating of high-purity heralded single photons
Francis-Jones, R. (Creator) & Mosley, P. (Project Leader), University of Bath, 12 Jan 2018