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Area of Science:

  • Quantum Information Science
  • Optical Communications
  • Cybersecurity

Background:

  • Classical and quantum communication channels face security vulnerabilities.
  • Quantum Key Distribution (QKD) offers theoretical security but suffers from distance-limited key rates.
  • Existing methods struggle with long-distance secure communication.

Purpose of the Study:

  • To investigate the physical limits of eavesdropper detection in quantum communication.
  • To demonstrate a novel quantum communication protocol for enhanced security over long distances.
  • To validate the efficiency of physical influence estimation for intrusion detection.

Main Methods:

  • Utilizing optical time domain reflectometry (OTDR) for intrusion detection.
  • Implementing a quantum communication protocol based on physical influence estimation.
  • Conducting experiments over extended fiber-optic links.

Main Results:

  • Successfully detected a 0.01 dB optical leakage, indicating eavesdropping.
  • Demonstrated protocol effectiveness over a distance of 1009 km.
  • Showcased extreme efficiency for eavesdropper detection at long ranges.

Conclusions:

  • The proposed quantum communication protocol enhances security over long distances.
  • Physical estimation of eavesdropper influence is a viable method for intrusion detection.
  • OTDR is effective for detecting subtle leakages in fiber-optic quantum communication systems.