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Proceedings Paper

High-speed photon counting techniques for broadband quantum key distribution
Author(s): D. Rogers; J. C. Bienfang; A. Mink; B. J. Hershman; A. Nakassis; L. Ma; X. Tang; D. H. Su; Charles W. Clark; Carl J. Williams
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Paper Abstract

Quantum Cryptography has demonstrated the potential for ultra-secure communications. However, with quantumchannel transmission rates in the MHz range, typical link losses and signal-to-noise ratios have resulted in keyproduction rates that are impractical for continuous one-time-pad encryption of high-bandwidth communications. We have developed high-speed data handling electronics that support quantum-channel transmission rates up to 1.25 GHz. This system has demonstrated error-corrected and privacy-amplified key rates above 1 Mbps over a free-space link. While the transmission rate is ultimately limited by timing jitter in the single-photon avalanche photodiodes (SPADs), we find the timing resolution of silicon SPADs sufficient to operate efficiently with temporal gates as short as 100 ps. We have developed systems to implement such high-resolution gating in our system, and anticipate the attendant reduction in noise to produce significantly higher secret-key bitrates.

Paper Details

Date Published: 25 October 2006
PDF: 5 pages
Proc. SPIE 6372, Advanced Photon Counting Techniques, 637211 (25 October 2006); doi: 10.1117/12.686188
Show Author Affiliations
D. Rogers, National Institute of Standards and Technology (United States)
J. C. Bienfang, National Institute of Standards and Technology (United States)
A. Mink, National Institute of Standards and Technology (United States)
B. J. Hershman, National Institute of Standards and Technology (United States)
A. Nakassis, National Institute of Standards and Technology (United States)
L. Ma, National Institute of Standards and Technology (United States)
X. Tang, National Institute of Standards and Technology (United States)
D. H. Su, National Institute of Standards and Technology (United States)
Charles W. Clark, National Institute of Standards and Technology (United States)
Carl J. Williams, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 6372:
Advanced Photon Counting Techniques
Wolfgang Becker, Editor(s)

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