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6 October 2021 Quantum key distribution with a bright telecom wavelength quantum dot single-photon source
Christopher L. Morrison, Francesco Graffitti, Zhe Xian Koong, Nick G. Stoltz, Dirk Bouwmeester, Alessandro Fedrizzi, Brian D. Gerardot
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Proceedings Volume 11881, Quantum Technology: Driving Commercialisation of an Enabling Science II; 1188103 (2021) https://doi.org/10.1117/12.2598936
Event: SPIE Photonex, 2021, Glasgow, United Kingdom
Abstract
A source of bright and pure single photons is an essential tool for photonic quantum technologies, predicted to enable secure communication and networking. Self-assembled quantum dots are among the leading candidates to realise such a source. The currently highest-performing quantum dots emit at wavelengths unsuitable for fibre transmission, with telecom quantum dots lagging in performance. An intermediate step is to use quantum frequency conversion. Here we report to our knowledge the brightest quantum dot based source of telecom photons by frequency converting a near-infrared quantum dot embedded in a micropillar cavity to the telecom C-band. In a single-photon BB84 protocol, this source is capable of producing asymptotic keys rates of 1 kbps at over 150 km of optical fibre.
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Christopher L. Morrison, Francesco Graffitti, Zhe Xian Koong, Nick G. Stoltz, Dirk Bouwmeester, Alessandro Fedrizzi, and Brian D. Gerardot "Quantum key distribution with a bright telecom wavelength quantum dot single-photon source", Proc. SPIE 11881, Quantum Technology: Driving Commercialisation of an Enabling Science II, 1188103 (6 October 2021); https://doi.org/10.1117/12.2598936
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KEYWORDS
Quantum dots
Quantum key distribution
Polarization
Single photon
Optical fibers
Receivers
Single photon detectors
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