title: Ultra fast quantum key distribution over a 97 km installed telecom fiber with wavelength division multiplexing clock synchronization.
abstract: 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.
authors.affiliation: System Platforms Research Laboratories, NEC Corporation, Kawasaki, Kanagawa, Japan. a-tanaka@dh.jp.nec.com
authors.forename: Akihiro
authors.initials: A
authors.lastname: Tanaka
authors.forename: Mikio
authors.initials: M
authors.lastname: Fujiwara
authors.forename: Sae W
authors.initials: SW
authors.lastname: Nam
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Nambu
authors.forename: Seigo
authors.initials: S
authors.lastname: Takahashi
authors.forename: Wakako
authors.initials: W
authors.lastname: Maeda
authors.forename: Ken-ichiro
authors.initials: K
authors.lastname: Yoshino
authors.forename: Shigehito
authors.initials: S
authors.lastname: Miki
authors.forename: Burm
authors.initials: B
authors.lastname: Baek
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
authors.forename: Akio
authors.initials: A
authors.lastname: Tajima
authors.forename: Masahide
authors.initials: M
authors.lastname: Sasaki
authors.forename: Akihisa
authors.initials: A
authors.lastname: Tomita
mesh_terms: 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*