User-independent optical path length compensation scheme with sub-ns timing resolution for 1xN quantum key distribution network system

Abstract

Quantum key distribution (QKD) networks constitute promising solutions for secure communication. Beyond conventional point-to-point QKD, we developed 1xN QKD network systems with a sub-ns resolution optical path length compensation scheme. With a practical plug-and-play QKD architecture and compact timing control modules based on a field programmable gate array (FPGA), we achieved long term stable operation of a 1x64 QKD network system. Using this architecture, 64 users can simultaneously share secret keys with one server, without using complex software algorithms and expensive hardware. We demonstrated the working of a 1x4 QKD network system using the fiber network of a metropolitan area.

arXiv commentTo be published in Photonics Research

References in corpus (8)

• Decoy State Quantum Key Distribution
• Quantum Key Distribution with High Loss: Toward Global Secure Communication
• Beating the PNS attack in practical quantum cryptography
• Field test of quantum key distribution in the Tokyo QKD Network
• Practical Decoy State for Quantum Key Distribution
• Measurement-device-independent quantum key distribution over untrustful metropolitan network
• Metropolitan all-pass and inter-city quantum communication network
• `Circular type' quantum key distribution