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Differential phase shift quantum key distribution using single-photon detectors based on a sinusoidally gated InGaAs/InP avalanche photodiode

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5 Author(s)
Namekata, N. ; Institute of Quantum Science, Nihon University, 1-4-18 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan ; Fujii, Go ; Inoue, Shuichiro ; Honjo, T.
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The authors report a quantum key distribution experiment, in which they implemented a differential phase shift quantum key distribution protocol, using single-photon detectors based on InGaAs/InP avalanche photodiodes operated with a sinusoidal gating. The single-photon detectors were operated at a repetition frequency of 500 MHz with low after pulsing probabilities and low dark counts. A sifted key generation rate of 1.5 Mbit/s was achieved over a communication distance of 15 km. Taking account of the security of the protocol against general individual attacks, secure keys can be generated with a rate of 0.33 Mbit/s.

Published in:

Applied Physics Letters  (Volume:91 ,  Issue: 1 )

Date of Publication:

Jul 2007

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