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Area of Science:

  • Quantum Information Science
  • Quantum Communication
  • Cybersecurity

Background:

  • Twin-field quantum key distribution (QKD) is crucial for long-distance secure fiber communication due to its rate-loss scaling.
  • Current TF-QKD systems require complex, resource-intensive interferometers, hindering scalability and real-world adoption.
  • The need for twin-field coherence in existing setups limits practical implementation.

Purpose of the Study:

  • To develop a simplified and scalable TF-QKD setup.
  • To overcome the limitations of complex interferometer structures in current TF-QKD systems.
  • To enable stable open-channel quantum communication for phase-sensitive applications.

Main Methods:

  • Introduced a novel technique to stabilize open channels without closed interferometers.
  • Utilized locally generated frequency combs to establish mutual coherence between distant sites.
  • Developed a versatile TF-QKD setup operable over asymmetric fiber links without dedicated service fibers.

Main Results:

  • Demonstrated a simplified and versatile TF-QKD setup.
  • Achieved stable operation over 100 km asymmetric fiber links.
  • Confirmed repeater-like behavior with a finite-size rate of 0.32 bit/s at 615.6 km.

Conclusions:

  • The developed technique offers a scalable and practical approach to TF-QKD.
  • This method enhances the feasibility of long-distance secure fiber communication.
  • The findings pave the way for broader adoption of advanced QKD technologies.