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-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.
Tang
Xiao
X
Ma
Lijun
L
Mink
Alan
A
Nakassis
Anastase
A
Xu
Hai
H
Hershman
Barry
B
Bienfang
Joshua C
JC
Su
David
D
Boisvert
Ronald F
RF
Clark
Charles W
CW
Williams
Carl J
CJ