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Efficient C-band single-photon upconversion with chip-scale Ti-indiffused pp-LiNbO3 waveguides

Xie, Z; Luo, KH; Chang, KC; Panoiu, NC; Herrmann, H; Silberhorn, C; Wong, CW; (2019) Efficient C-band single-photon upconversion with chip-scale Ti-indiffused pp-LiNbO3 waveguides. Applied Optics , 58 (22) pp. 5910-5915. 10.1364/AO.58.005910. Green open access

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Abstract

Frequency upconversion for single photons at telecom wavelengths is important to simultaneously meet the different wavelength requirements for long-distance communications and quantum memories in a quantum nodal network. It also enables the detection for the telecom “flying qubit” photons with silicon-based efficient single-photon detectors with low dark count (DC) rates. Here, we demonstrate the frequency upconversion of attenuated single photons, using a low-loss titanium-indiffused periodically poled lithium niobate waveguide, pumped with a readily available erbium-doped fiber amplifier in the L-band. Internal and conversion efficiencies up to 84.4% and 49.9% have been achieved, respectively. The DC rates are suppressed down to 44 kHz at 13.9% end-to-end quantum efficiency (including full conversion and detection), enabled by our long-wavelength pump configuration and narrow 3.5-GHz bandpass filtering.

Type: Article
Title: Efficient C-band single-photon upconversion with chip-scale Ti-indiffused pp-LiNbO3 waveguides
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/AO.58.005910
Publisher version: https://doi.org/10.1364/AO.58.005910
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10081060
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