Ultra fast quantum key distribution over a 97 km installed telecom fiber with wavelength division multiplexing clock synchronization.
We demonstrated ultra fast BB84 quantum key distribution (QKD) transmission at 625 MHz clock rate through a 97 km field-installed fiber using practical clock synchronization based on wavelength-division multiplexing (WDM). We succeeded in over-one-hour stable key generation at a high sifted key rate of 2.4 kbps and a low quantum bit error rate (QBER) of 2.9%. The asymptotic secure key rate was estimated to be 0.78- 0.82 kbps from the transmission data with the decoy method of average photon numbers 0, 0.15, and 0.4 photons/pulse.
Tanaka
Akihiro
A
System Platforms Research Laboratories, NEC Corporation, Kawasaki, Kanagawa, Japan. a-tanaka@dh.jp.nec.com
Fujiwara
Mikio
M
Nam
Sae W
SW
Nambu
Yoshihiro
Y
Takahashi
Seigo
S
Maeda
Wakako
W
Yoshino
Ken-ichiro
K
Miki
Shigehito
S
Baek
Burm
B
Wang
Zhen
Z
Tajima
Akio
A
Sasaki
Masahide
M
Tomita
Akihisa
A
D003195:Computer Communication Networks / Q000295:instrumentation*; D016494:Computer Security / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D055095:Optics and Photonics / Q000295:instrumentation*; D009991:Oscillometry / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*