title: High-speed wavelength-division multiplexing quantum key distribution system.
abstract: A high-speed quantum key distribution system was developed with the wavelength-division multiplexing (WDM) technique and dedicated key distillation hardware engines. Two interferometers for encoding and decoding are shared over eight wavelengths to reduce the system's size, cost, and control complexity. The key distillation engines can process a huge amount of data from the WDM channels by using a 1 Mbit block in real time. We demonstrated a three-channel WDM system that simultaneously uses avalanche photodiodes and superconducting single-photon detectors. We achieved 12 h continuous key generation with a secure key rate of 208 kilobits per second through a 45 km field fiber with 14.5 dB loss.
authors.affiliation: System Platforms Research Laboratories, NEC Corporation, Nakahara-ku, Kawasaki, Japan. yoshino@bp.jp.nec.com
authors.forename: Ken-ichiro
authors.initials: K
authors.lastname: Yoshino
authors.forename: Mikio
authors.initials: M
authors.lastname: Fujiwara
authors.forename: Akihiro
authors.initials: A
authors.lastname: Tanaka
authors.forename: Seigo
authors.initials: S
authors.lastname: Takahashi
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Nambu
authors.forename: Akihisa
authors.initials: A
authors.lastname: Tomita
authors.forename: Shigehito
authors.initials: S
authors.lastname: Miki
authors.forename: Taro
authors.initials: T
authors.lastname: Yamashita
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
authors.forename: Masahide
authors.initials: M
authors.lastname: Sasaki
authors.forename: Akio
authors.initials: A
authors.lastname: Tajima