Wide Area Key Distribution Network Based on a Quantum Key Distribution System

European Quantum Key Distribution Network

Information is one of the key assets of our society. Secure communication is vital for economy, national and international stability. Quantum key distribution (QKD) has closed a remaining security loophole in classical information science, namely the secure cryptographic key exchange. In the past 27 years since the invention of QKD a lot of effort has been invested to bring QKD to practical app...

Field and long-term demonstration of a wide area quantum key distribution network

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-...

Chip-based quantum key distribution

Improvement in secure transmission of information is an urgent need for governments, corporations and individuals. Quantum key distribution (QKD) promises security based on the laws of physics and has rapidly grown from proof-of-concept to robust demonstrations and deployment of commercial systems. Despite these advances, QKD has not been widely adopted, and large-scale deployment will likely r...

A fiber-based quasi-continuous-wave quantum key distribution system

We report a fiber-based quasi-continuous-wave (CW) quantum key distribution (QKD) system with continuous variables (CV). This system employs coherent light pulses and time multiplexing to maximally reduce cross talk in the fiber. No-switching detection scheme is adopted to optimize the repetition rate. Information is encoded on the sideband of the pulsed coherent light to fully exploit the cont...

Quantum Key Distribution