A novel switched interferometric quantum key distribution system

P. A. Hiskett; C. G. Peterson; D. Rosenberg; S. Nam; A. E. Lita; A. J. Miller; R. J. Hughes; J. E. Nordholt

doi:10.1117/12.733265

25 September 2007 A novel switched interferometric quantum key distribution system

P. A. Hiskett, C. G. Peterson, D. Rosenberg, S. Nam, A. E. Lita, A. J. Miller, R. J. Hughes, J. E. Nordholt

Proceedings Volume 6710, Quantum Communications and Quantum Imaging V; 67100S (2007) https://doi.org/10.1117/12.733265
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.733265

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