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25 September 2007 A novel switched interferometric quantum key distribution system
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A novel system for ultra-long-distance quantum key distribution in optical fiber, incorporating ultra-low-noise transition-edge sensor (TES) photodetectors, is described. Integration of the TES detectors into the system was facilitated with a unique optically switched interferometer design. The performance of the system over 101 km of dark, single-mode fiber at 1550 nm and a clock rate of 1 MHz is described. Secret-key bits were produced after error correction and privacy amplification when using mean photon numbers of 0.01, 0.0148, 0.02, 0.0304, and 0.2 photons/pulse at the output of the transmitter. At a mean photon number of 0.1 photons per pulse at the transmitter, a transmission line loss of 29.92 dB, roughly equivalent to 150 km of optical fiber, could be tolerated and secret bits extracted from the transmitted key.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
P. A. Hiskett, C. G. Peterson, D. Rosenberg, S. Nam, A. E. Lita, A. J. Miller, R. J. Hughes, and J. E. Nordholt "A novel switched interferometric quantum key distribution system", Proc. SPIE 6710, Quantum Communications and Quantum Imaging V, 67100S (25 September 2007);

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