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Twin-Field Quantum Key Distribution with Local Frequency Reference.

Jiu-Peng Chen1,2, Fei Zhou1,2, Chi Zhang1,2

  • 1<a href="https://ror.org/02557nd11">Jinan Institute of Quantum Technology</a> and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Jinan 250101, China.

Physical Review Letters
|July 12, 2024
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Summary
This summary is machine-generated.

This study presents a practical method for twin-field quantum key distribution (TFQKD) using acetylene as a reference, overcoming frequency differences for secure long-distance communication.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication
  • Quantum Cryptography

Background:

  • Twin-field quantum key distribution (TFQKD) offers enhanced secure key rates over long distances by overcoming the linear rate-loss limit.
  • Practical implementation of TFQKD is challenged by the complexity of aligning frequencies from independent laser sources.

Purpose of the Study:

  • To analyze frequency stability requirements for TFQKD with stabilized lasers.
  • To propose and demonstrate a simplified, practical TFQKD approach independent of fast frequency locking.
  • To enable high-performance TFQKD over extended optical fiber links.

Main Methods:

  • Analysis of frequency stability requirements for TFQKD systems.
  • Utilization of saturated absorption spectroscopy of acetylene as an absolute frequency reference.
  • Experimental demonstration using the 4-intensity sending-or-not-sending TFQKD protocol.

Main Results:

  • Determined precise frequency stability requirements for implementing TFQKD.
  • Successfully demonstrated TFQKD over 502 km, 301 km, and 201 km of ultralow-loss optical fiber.
  • Validated a practical approach that eliminates the need for fast frequency locking.

Conclusions:

  • The proposed acetylene-referenced method simplifies TFQKD implementation.
  • This high-performance TFQKD scheme is suitable for future intercity and free-space quantum networks.
  • Overcoming frequency mismatch is crucial for practical long-distance quantum communication.