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Related Experiment Video

Updated: Jul 24, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Twin-Field Quantum Key Distribution without Phase Locking.

Wei Li^1,2, Likang Zhang^1,2, Yichen Lu^1,2

¹Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China.

Physical Review Letters

|July 7, 2023

Summary

This summary is machine-generated.

This study introduces a novel twin-field quantum key distribution (TF-QKD) method that eliminates the need for phase locking. This breakthrough simplifies quantum communication systems and enhances secret key rates over long fiber distances.

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Area of Science:

Quantum Communication
Quantum Cryptography
Information Security

Background:

Twin-field quantum key distribution (TF-QKD) is crucial for secure long-haul quantum communication.
Existing TF-QKD systems require complex phase locking techniques, hindering practical implementation.

Purpose of the Study:

To develop and demonstrate a phase-locking-free TF-QKD protocol.
To simplify TF-QKD systems for wider adoption and scalability.

Main Methods:

A novel approach using reference and quantum frames to establish a global phase reference.
Development of a fast Fourier transform-based algorithm for efficient phase reconciliation via postprocessing.
Experimental demonstration over standard optical fibers ranging from short to long distances.

Main Results:

Successful implementation of TF-QKD without phase locking.
Achieved a secret key rate (SKR) of 1.27 Mbit/s at 50 km.
Demonstrated repeater-like key rate scaling at 504 km, achieving 34 times higher SKR than repeaterless capacity.

Conclusions:

The proposed method offers a scalable and practical solution for TF-QKD.
Eliminating phase locking significantly simplifies TF-QKD systems.
This advancement is a key step towards the widespread application of TF-QKD.