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Related Experiment Video

Updated: Jun 5, 2026

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Published on: September 8, 2023

Metropolitan all-pass and inter-city quantum communication network.

Teng-Yun Chen1, Jian Wang, Hao Liang

  • 1Hefei National Laboratory for Physical Sciences at Microscale, Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui, China.

Optics Express
|January 4, 2011
PubMed
Summary

A metropolitan quantum communication network was established for secure quantum key distribution (QKD) between four nodes. The network supports real-time voice communication using one-time pad encoding, demonstrating practical quantum networking applications.

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Area of Science:

  • Quantum communication networks
  • Applied quantum cryptography
  • Fiber optic networks

Background:

  • Quantum key distribution (QKD) offers enhanced security over classical cryptography.
  • Implementing QKD in metropolitan areas presents significant technical challenges.
  • Previous quantum networks have been limited in scope and functionality.

Purpose of the Study:

  • To demonstrate a practical, metropolitan-scale quantum communication network.
  • To enable secure quantum key distribution (QKD) between multiple nodes.
  • To establish secure real-time communication over the quantum network.

Main Methods:

  • Development of an all-pass quantum communication network with four nodes using field fiber.
  • Integration of an optical switching module for arbitrary 2-connectivity.
  • Design of integrated quantum key distribution (QKD) terminals capable of transmitting and receiving.
  • Seamless integration of an additional 60 km fiber link using a trusted relay architecture.
  • Implementation of the decoy state protocol for all links.
  • Tailored design of all necessary hardware, synchronization, control, and software for automated operation.

Main Results:

  • Successful demonstration of a metropolitan all-pass quantum communication network.
  • Arbitrary 2-connectivity achieved among output ports via an optical switching module.
  • Integrated QKD terminals operated effectively as transmitters, receivers, or both.
  • A 60 km fiber link was seamlessly integrated, extending network reach.
  • The decoy state protocol was successfully implemented on all network links.
  • Fully automated and stable network operation was achieved.
  • Real-time voice telephone communication with one-time pad encoding was established between up to five nodes within 60 km.

Conclusions:

  • The demonstrated network represents a significant advancement in metropolitan quantum communication.
  • The system proves the feasibility of secure, real-time communication over deployed fiber infrastructure.
  • The integrated design and automated operation pave the way for practical quantum network deployment.