Abstract
We report in this paper a gigahertz clocked quantum key distribution (QKD) system using only practical components. Compact semiconductor avalanche photodiodes are used for high-speed single photon detection, whereas an attenuated laser is used as a light source in combination with the decoy protocol for guarding against photon-number-splitting attacks. The system is characterized by secure key rates of 1.02 Mbit s−1 for a fibre distance of 20 km and 10.1 kbit s−1 for 100 km. The suitability of standard single mode fibres as the quantum channel is also demonstrated.
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