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Conference on Lasers and Electro-Optics

Multiplexed Classical and Quantum Transmission for High Bitrate Quantum Key Distribution Systems

Ketaki A. Patel, J. F. Dynes, Iris Choi, A. W. Sharpe, A. R. Dixon, Zhiliang L. Yuan, Richard V. Penty, Andrew J. Shields

Published Jan 1, 2012• 1 citation
Publisher

Abstract

We report the operation of a gigahertz clocked quantum key distribution system, with two classical data communication channels using coarse wavelength division multiplexing over a record fibre distance of 80km.
DOI
10.1364/qels.2012.qm2h.5

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We demonstrate quantum key distribution (QKD) with bidirectional 10 Gb/s classical data channels in a single fiber using dense wavelength division multiplexing. Record secure key rates of 2.38 Mbps and fiber distances up to 70 km are achieved. Data channels are simultaneously monitored for error-free operation. The robustness of QKD is further demonstrated with a secure key rate of 445 kbps over 25 km, obtained in the presence of data lasers launching conventional 0 dBm power. We discuss the fundamental limit for the QKD performance in the multiplexing environment.
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