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Electronic Distance Measuring Instruments01:30

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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Time-bin encoded quantum key distribution over 120 km with a telecom quantum dot source.

Jipeng Wang1, Joscha Hanel1, Zenghui Jiang1

  • 1Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, 30167, Hannover, Germany.

Light, Science & Applications
|February 24, 2026
PubMed
Summary
This summary is machine-generated.

This study demonstrates a robust quantum key distribution (QKD) system using a quantum dot (QD) single-photon source with time-bin encoding. The system achieves high secure key rates over 120km fiber, advancing secure communication networks.

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Area of Science:

  • Quantum Information Science
  • Optoelectronics
  • Secure Communications

Background:

  • Previous quantum key distribution (QKD) systems often used polarization encoding, vulnerable to fiber optic imperfections.
  • Time-bin encoding offers superior robustness but its integration with deterministic single-photon sources remained experimentally unproven.

Purpose of the Study:

  • To experimentally demonstrate a time-bin encoded QKD system utilizing a deterministic quantum dot (QD) single-photon source.
  • To validate the feasibility and performance of this integrated approach for secure communication over long fiber links.

Main Methods:

  • Developed a QKD system with a high-brightness, telecom-wavelength quantum dot (QD) single-photon source.
  • Implemented time-bin encoding for enhanced robustness against channel disturbances.
  • Conducted proof-of-concept experiments over a 120km fiber optic link.

Main Results:

  • Successfully demonstrated secure key distribution using the QD-based time-bin encoded QKD system.
  • Achieved extraordinary long-term stability over 6 hours of continuous operation.
  • Established the highest secure key rate for time-bin QKD systems based on single-photon sources.

Conclusions:

  • Provides the first experimental validation of integrating a QD single-photon source with time-bin encoding in a telecom-band QKD system.
  • Signifies a substantial advancement for robust and scalable QKD networks utilizing solid-state single-photon technology.
  • Paves the way for practical, high-performance quantum communication networks.