Field Experiment on a Robust Hierarchical Metropolitan Quantum Cryptography Network
Fangxing Xu, Wei Chen, Shuang Wang, Zhenqiang Yin, Yang Zhang, Yun, Liu, Zheng Zhou, Yibo Zhao, Hongwei Li, Dong Liu, Zhengfu Han, Guangcan Guo

TL;DR
This paper reports a practical hierarchical metropolitan quantum cryptography network using telecom fiber cables, demonstrating secure communication among government departments with high security and expandability.
Contribution
It introduces a scalable, hierarchical quantum cryptography network with integrated quantum routers, optical switches, and trusted relays for practical secure communications.
Findings
Successful implementation of a 7-user quantum cryptography network
Secure key distribution enabling encrypted multimedia communication
Demonstration of network expandability and practical application
Abstract
A hierarchical metropolitan quantum cryptography network upon the inner-city commercial telecom fiber cables is reported in this paper. The seven-user network contains a four-node backbone net with one node acting as the subnet gateway, a two-user subnet and a single-fiber access link, which is realized by the Faraday-Michelson Interferometer set-ups. The techniques of the quantum router, optical switch and trusted relay are assembled here to guarantee the feasibility and expandability of the quantum cryptography network. Five nodes of the network are located in the government departments and the secure keys generated by the quantum key distribution network are utilized to encrypt the instant video, sound, text messages and confidential files transmitting between these bureaus. The whole implementation including the hierarchical quantum cryptographic communication network links and…
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Taxonomy
TopicsQuantum Information and Cryptography · Quantum optics and atomic interactions · Quantum Computing Algorithms and Architecture
