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Integrated Distributed Sensing and Quantum Communication Networks.

Yuehan Xu1, Tao Wang1,2,3, Peng Huang1,2,3

  • 1State Key Laboratory of Advanced Optical Communication Systems and Networks, Center of Quantum Sensing and Information Processing, Shanghai Jiao Tong University, Shanghai 200240, China.

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Summary
This summary is machine-generated.

We developed an integrated sensing and quantum network (ISAQN) for secure communication and distributed sensing over optical fibers. This novel system enables simultaneous high-precision sensing and secure key distribution in multipoint networks.

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Area of Science:

  • Quantum communication
  • Optical fiber sensing
  • Network security

Background:

  • Integrated sensing and communication systems leverage optical fibers for diverse applications like seismic detection.
  • Quantum communication networks are emerging, utilizing optical fiber infrastructure.
  • Existing systems lack simultaneous secure communication and distributed sensing capabilities.

Purpose of the Study:

  • To propose and demonstrate an integrated sensing and quantum network (ISAQN) scheme.
  • To achieve secure key distribution among multiple nodes.
  • To enable distributed sensing with high precision.

Main Methods:

  • Utilized continuous variables quantum key distribution and a round-trip multiband structure for secure key distribution.
  • Developed a spectrum phase monitoring protocol for distributed sensing.
  • Experimentally simulated vibrations in a star network topology.

Main Results:

  • Achieved a secret key rate of ~0.7 Mbits/s per user over 10-km fiber with a network capacity of 8.
  • Demonstrated distributed sensing with a vibration response bandwidth of 1 Hz to 2 kHz.
  • Obtained a strain resolution of 0.50 μm/m and spatial resolution of 0.20 m under shot-noise-limited detection.

Conclusions:

  • The ISAQN scheme successfully integrates secure quantum communication and distributed sensing.
  • This technology lays the foundation for future large-scale quantum networks and high-precision sensing networks.
  • Enables simultaneous, multipoint secure communication and sensing capabilities.