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

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-rat...

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Bibliographic Details
Published in:Optics express 2006-03, Vol.14 (6), p.2062-2070
Main Authors: Tang, Xiao, Ma, Lijun, Mink, Alan, Nakassis, Anastase, Xu, Hai, Hershman, Barry, Bienfang, Joshua C, Su, David, Boisvert, Ronald F, Clark, Charles W, Williams, Carl J
Format: Article
Language:English
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Summary: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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.14.002062