Gigahertz decoy quantum key distribution with 1 Mbit/s secure key rate

Details Gigahertz decoy quantum key distribution with 1 Mbit/s secure key rate Gigahertz decoy quantum key distribution with 1 Mbit/s secure key rate

2008-10-06

arxiv.org/abs/0810.1069v1

Optics Express 16, 18790 (2008).

Physics

Quantum Physics

14 pages, 3 figures

Scientific paper

10.1364/OE.16.018790

We report the first gigahertz clocked decoy-protocol quantum key distribution (QKD). Record key rates have been achieved thanks to the use of self-differencing InGaAs avalanche photodiodes designed specifically for high speed single photon detection. The system is characterized with a secure key rate of 1.02 Mbit/s for a fiber distance of 20 km and 10.1 kbit/s for 100 km. As the present advance relies upon compact non-cryogenic detectors, it opens the door towards practical and low cost QKD systems to secure broadband communication in future.

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