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Source ofCorrelated PhotonPairs forQuantum Information UsingPhotonic Crystal Fiber

J. J. Russell

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

We demonstrate a bright, narrowband, polarized, single-mode, low-background source of correlated photon pairs inphotonic crystal fibre, forquantum information applications. Wedetect 105 coincidences/s atwavelengths of595nmand880nmusing Silicon detectors.

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Pure state single photons are at the heart of optical quantum technologies. We have previously reported the generation of photon pairs by four-wave mixing in a single-mode photonic crystal fibre (PCF) and the use of a new birefringent phase matching scheme which results in the generation of narrowband signal photons, around 0.2 nm in bandwidth, and a factorizable photon pair state with no requirement for spectral filtering, leading to increased count rates. Our source is bright, polarized, and tuneable by variable laser wavelength and fibre parameters. Hong-Ou-Mandel (HOM) interference is observed between photons from two of these sources, a requirement for optical quantum information tasks.
The paper reviews a new source of time-correlated photon pairs based on phase matched four-wave mixing in an optical fiber. This source has the potential to replace sources based on a non-linear birefringent crystals and waveguides. It generates linear polarised photon pairs in a narrow bandwidth, single circular mode which can be efficiently coupled into single mode fibres. We generate the parametric gain by pumping with a laser wavelength slightly below the zero dispersion wavelength, in the normal dispersion regime.