title: Experimental study of high speed polarization-coding quantum key distribution with sifted-key rates over Mbit/s.
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.
authors.forename: Xiao
authors.initials: X
authors.lastname: Tang
authors.forename: Lijun
authors.initials: L
authors.lastname: Ma
authors.forename: Alan
authors.initials: A
authors.lastname: Mink
authors.forename: Anastase
authors.initials: A
authors.lastname: Nakassis
authors.forename: Hai
authors.initials: H
authors.lastname: Xu
authors.forename: Barry
authors.initials: B
authors.lastname: Hershman
authors.forename: Joshua C
authors.initials: JC
authors.lastname: Bienfang
authors.forename: David
authors.initials: D
authors.lastname: Su
authors.forename: Ronald F
authors.initials: RF
authors.lastname: Boisvert
authors.forename: Charles W
authors.initials: CW
authors.lastname: Clark
authors.forename: Carl J
authors.initials: CJ
authors.lastname: Williams