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. 2018 Nov 9;121(19):190502.
doi: 10.1103/PhysRevLett.121.190502.

Secure Quantum Key Distribution over 421 km of Optical Fiber

Alberto Boaron  1 , Gianluca Boso  1 , Davide Rusca  1 , Cédric Vulliez  1 , Claire Autebert  1 , Misael Caloz  1 , Matthieu Perrenoud  1 , Gaëtan Gras  1   2 , Félix Bussières  1 , Ming-Jun Li  3 , Daniel Nolan  3 , Anthony Martin  1 , Hugo Zbinden  1
Affiliations

Secure Quantum Key Distribution over 421 km of Optical Fiber

Alberto Boaron et al. Phys Rev Lett. .

Abstract

We present a quantum key distribution system with a 2.5 GHz repetition rate using a three-state time-bin protocol combined with a one-decoy approach. Taking advantage of superconducting single-photon detectors optimized for quantum key distribution and ultralow-loss fiber, we can distribute secret keys at a maximum distance of 421 km and obtain secret key rates of 6.5 bps over 405 km.

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