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Conference on Lasers and Electro-Optics

Practical Quantum Key Distribution Over 100 km Using Sinusoidally Gated InGaAs/InP Avalanche Photodiodes

Naoto Namekata, Hiroki Takesue, Toshimori Honjo, 康弘 都倉, Shuichiro Inoue

Published Jan 1, 2011• 0 citations
Publisher

Abstract

We report on the quantum key distribution experiment using ultra-low-noise 2-GHz sinusoidally gated InGaAs/InP avalanche photodiodes. The detectors enabled us to distribute secure keys over 100 km with a bit rate of 24 kbps.
DOI
10.1364/cleo_at.2011.jtuc3

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We have demonstrated quantum key distribution (QKD) over 100 km using single-photon detectors based on InGaAs/InP avalanche photodiodes (APDs). We implemented the differential phase shift QKD (DPS-QKD) protocol with electrically cooled and 2-GHz sinusoidally gated APDs. The single-photon detector has a dark count probability of 2.8 × 10(-8) (55 counts per second) with a detection efficiency of 6 %, which enabled us to achieve 24 kbit/s secure key rate over 100 km of optical fiber. The DPS-QKD system offers better performances in a practical way than those achieved using superconducting single-photon detectors. Moreover, the distance that secure keys against the general individual attacks can be distributed has been extended to 160 km.
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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 500MHz with low after pulsing probabilities and low dark counts. A sifted key generation rate of 1.5Mbit∕s was achieved over a communication distance of 15km. Taking account of the security of the protocol against general individual attacks, secure keys can be generated with a rate of 0.33Mbit∕s.