Abstract
A real-time quantum key distribution (QKD) system is developed in this
paper. In the system, based on the feature of a field-programmable gate array,
secure key extraction control and algorithm have been optimally designed to
perform sifting, error correction, and privacy amplification altogether in
real time. In the QKD experiment, information synchronization mechanism and
high-speed classic data channel are designed to ensure the steady operation
of the system. Decoy state and synchronous laser light source are used in
the system, while the length of optical fiber between Alice and Bob is 20
km. With photons repetition frequency of 20 MHz, the final key rate could
reach 17 kb/s. Smooth and robust operation is verified with 6 h continuous
test and associated with encrypted voice communication test.
© 2012 IEEE
PDF Article
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