title: Field and long-term demonstration of a wide area quantum key distribution network.
abstract: A wide area quantum key distribution (QKD) network deployed on communication infrastructures provided by China Mobile Ltd. is demonstrated. Three cities and two metropolitan area QKD networks were linked up to form the Hefei-Chaohu-Wuhu wide area QKD network with over 150 kilometers coverage area, in which Hefei metropolitan area QKD network was a typical full-mesh core network to offer all-to-all interconnections, and Wuhu metropolitan area QKD network was a representative quantum access network with point-to-multipoint configuration. The whole wide area QKD network ran for more than 5000 hours, from 21 December 2011 to 19 July 2012, and part of the network stopped until last December. To adapt to the complex and volatile field environment, the Faraday-Michelson QKD system with several stability measures was adopted when we designed QKD devices. Through standardized design of QKD devices, resolution of symmetry problem of QKD devices, and seamless switching in dynamic QKD network, we realized the effective integration between point-to-point QKD techniques and networking schemes.
authors.forename: Shuang
authors.initials: S
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Zhen-Qiang
authors.initials: ZQ
authors.lastname: Yin
authors.forename: Hong-Wei
authors.initials: HW
authors.lastname: Li
authors.forename: De-Yong
authors.initials: DY
authors.lastname: He
authors.forename: Yu-Hu
authors.initials: YH
authors.lastname: Li
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zhou
authors.forename: Xiao-Tian
authors.initials: XT
authors.lastname: Song
authors.forename: Fang-Yi
authors.initials: FY
authors.lastname: Li
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.forename: Hua
authors.initials: H
authors.lastname: Chen
authors.forename: Yun-Guang
authors.initials: YG
authors.lastname: Han
authors.forename: Jing-Zheng
authors.initials: JZ
authors.lastname: Huang
authors.forename: Jun-Fu
authors.initials: JF
authors.lastname: Guo
authors.forename: Peng-Lei
authors.initials: PL
authors.lastname: Hao
authors.forename: Mo
authors.initials: M
authors.lastname: Li
authors.forename: Chun-Mei
authors.initials: CM
authors.lastname: Zhang
authors.forename: Dong
authors.initials: D
authors.lastname: Liu
authors.forename: Wen-Ye
authors.initials: WY
authors.lastname: Liang
authors.forename: Chun-Hua
authors.initials: CH
authors.lastname: Miao
authors.forename: Ping
authors.initials: P
authors.lastname: Wu
authors.forename: Guang-Can
authors.initials: GC
authors.lastname: Guo
authors.forename: Zheng-Fu
authors.initials: ZF
authors.lastname: Han