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Experimental study of high speed polarization-coding quantum key distribution with sifted-key rates over Mbit/s

TitleExperimental study of high speed polarization-coding quantum key distribution with sifted-key rates over Mbit/s
Publication TypeJournal Article
Year of Publication2006
AuthorsX. Tang, L. Ma, A. Mink, A. Nakassis, H. Xu, B. Hershman, J. C. Bienfang, D. Su, R. F. Boisvert, C. W. Clark, and C. J. Williams
JournalOptics Express
Volume14
Pagination2062
ISSN1094-4087
Keywords2006, Fiber optics communications, Multiple Fellows, Optical communications, Photon counting, Quantum detectors
Abstract

We present a quantitative study of various limitations on quantum cryptographic systems operating with sifted-key rates over Mbit/s. The dead time of silicon APDs not only limits the sifted-key rate but also causes correlation between the neighboring key bits. In addition to the well-known count-rate dependent timing jitter in avalanche photo-diode (APD), the faint laser sources, the vertical cavity surface emission lasers (VCSELs) in our system, also induce a significant amount of data-dependent timing jitter. Both the dead time and the data-dependent timing jitter are major limiting factors in designing QKD systems with sifted-key rates beyond Mbit/s.

URLhttp://www.opticsexpress.org/abstract.cfm?URI=oe-14-6-2062