29 August 2006 Demonstration of an active quantum key distribution network
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We previously demonstrated a high speed, point to point, quantum key distribution (QKD) system with polarization coding over a fiber link, in which the resulting cryptographic keys were used for one-time pad encryption of real time video signals. In this work, we extend the technology to a three-node active QKD network - one Alice and two Bobs. A QKD network allows multiple users to generate and share secure quantum keys. In comparison with a passive QKD network, nodes in an active network can actively select a destination as a communication partner and therefore, its sifted-key rate can remain at a speed almost as high as that in the point-to-point QKD. We demonstrate our three-node QKD network in the context of a QKD secured real-time video surveillance system. In principle, the technologies for the three-node network are extendable to multi-node networks easily. In this paper, we report our experiments, including the techniques for timing alignment and polarization recovery during switching, and discuss the network architecture and its expandability to multi-node networks.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xiao Tang, Xiao Tang, Lijun Ma, Lijun Ma, Alan Mink, Alan Mink, Anastase Nakassis, Anastase Nakassis, Hai Xu, Hai Xu, Barry Hershman, Barry Hershman, Joshua Bienfang, Joshua Bienfang, David Su, David Su, Ronald F. Boisvert, Ronald F. Boisvert, Charles Clark, Charles Clark, Carl Williams, Carl Williams, } "Demonstration of an active quantum key distribution network", Proc. SPIE 6305, Quantum Communications and Quantum Imaging IV, 630506 (29 August 2006); doi: 10.1117/12.679589; https://doi.org/10.1117/12.679589

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