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Raman-free fibered photon-pair source

Abstract : Raman-scattering noise in silica has been the key obstacle toward the realisation of high quality fiber-based photon-pair sources. Here, we experimentally demonstrate how to get past this limitation by dispersion tailoring a xenon-filled hollow-core photonic crystal fiber. The source operates at room temperature, and is designed to generate Raman-free photon-pairs at useful wavelength ranges, with idler in the telecom, and signal in the visible range. We achieve a coincidence-to-accidentals ratio as high as 2740 combined with an ultra low heralded second order coherence g(2)H(0)=0.002, indicating a very high signal to noise ratio and a negligible multi-photon emission probability. Moreover, by gas-pressure tuning, we demonstrate the control of photon frequencies over a range as large as 13 THz, covering S-C and L telecom band for the idler photon. This work demonstrates that hollow-core photonic crystal fiber is an excellent platform to design high quality photon-pair sources, and could play a driving role in the emerging quantum technology.
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Submitted on : Tuesday, July 7, 2020 - 9:04:50 AM
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Martin Cordier, Philippe Delaye, Frédéric Gérôme, Fetah Benabid, Isabelle Zaquine. Raman-free fibered photon-pair source. Scientific Reports, Nature Publishing Group, 2020, 10, pp.1650. ⟨10.1038/s41598-020-58229-7⟩. ⟨hal-02498730⟩

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