Differential-phase-shift quantum key distribution experiment using fast physical random bit generator with chaotic semiconductor lasers.
A high speed physical random bit generator is applied for the first time to a gigahertz clocked quantum key distribution system. Random phase-modulation in a differential-phase-shift quantum key distribution (DPS-QKD) system is performed using a 1-Gbps random bit signal which is generated by a physical random bit generator with chaotic semiconductor lasers. Stable operation is demonstrated for over one hour, and sifted keys are successfully generated at a rate of 9.0 kbps with a quantum bit error rate of 3.2% after 25-km fiber transmission.
Honjo
Toshimori
T
NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi-shi,Kanagawa, 243-0198, Japan. honjo@will.brl.ntt.co.jp
Uchida
Atsushi
A
Amano
Kazuya
K
Hirano
Kunihito
K
Someya
Hiroyuki
H
Okumura
Haruka
H
Yoshimura
Kazuyuki
K
Davis
Peter
P
Tokura
Yasuhiro
Y
D003195:Computer Communication Networks / Q000295:instrumentation*; D016494:Computer Security / Q000295:instrumentation*; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D054023:Lasers, Semiconductor; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*