25 August 2005 High speed fiber-based quantum key distribution using polarization encoding
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Abstract
We have implemented a quantum key distribution (QKD) system with polarization encoding at 850 nm over 1 km of optical fiber. The high-speed management of the bit-stream, generation of random numbers and processing of the sifting algorithm are all handled by a pair of custom data handling circuit boards. As a complete system using a clock rate of 1.25 Gbit/s, it produces sifted keys at a rate of 1.1 Mb/s with an error rate lower than 1.3% while operating at a transmission rate of 312.5 Mbit/s and a mean photon number μ = 0.1. With a number of proposed improvements this system has a potential for a higher key rate without an elevated error rate.
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Xiao Tang, Xiao Tang, Lijun Ma, Lijun Ma, Alan Mink, Alan Mink, Anastase Nakassis, Anastase Nakassis, Barry Hershman, Barry Hershman, Joshua Bienfang, Joshua Bienfang, Ronald F. Boisvert, Ronald F. Boisvert, Charles Clark, Charles Clark, Carl Williams, Carl Williams, } "High speed fiber-based quantum key distribution using polarization encoding", Proc. SPIE 5893, Quantum Communications and Quantum Imaging III, 58931A (25 August 2005); doi: 10.1117/12.614598; https://doi.org/10.1117/12.614598
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