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Related Experiment Video

Updated: Jun 21, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Continuous high speed coherent one-way quantum key distribution.

Damien Stucki1, Claudio Barreiro, Sylvain Fasel

  • 1Group of Applied Physics, University of Geneva, 1211, Geneva 4, Switzerland.

Optics Express
|August 6, 2009
PubMed
Summary
This summary is machine-generated.

This study presents a novel quantum key distribution (QKD) system, integrating a high-speed protocol and advanced detection for real-world fiber networks. The system achieved secure key generation over 150 km, demonstrating practical QKD implementation.

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Published on: September 5, 2019

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Last Updated: Jun 21, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

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

Published on: September 5, 2019

Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Photonics Engineering

Background:

  • Quantum Key Distribution (QKD) is a leading quantum technology for secure communication.
  • Real-world implementation of QKD faces challenges in system control and integration.
  • Existing QKD systems require robust performance in diverse network environments.

Purpose of the Study:

  • To develop and demonstrate a fully functional, real-world QKD system.
  • To integrate a high-speed protocol, high-performance detection, and standard fiber network connectivity.
  • To assess the system's performance and reliability in a live telecommunications network.

Main Methods:

  • Development of a simple, high-speed QKD protocol.
  • Integration of high-performance single-photon detectors.
  • Component-level and fiber network integration for standard connectivity.
  • Testing and comparison with InGaAs avalanche photodiodes and superconducting detectors.

Main Results:

  • The first real-world implementation of a fully functional QKD system.
  • Successful operation over a 43 dB-loss (150 km) transmission line in a live fiber optic network.
  • Achieved average real-time key distribution rates of 2.5 bps over 3 hours.
  • Demonstrated continuous and autonomous operation with real-time secret key generation.

Conclusions:

  • The integrated QKD system offers a practical solution for secure communication over existing fiber infrastructure.
  • The system's performance is validated through laboratory and field tests, including comparisons with advanced detectors.
  • This work paves the way for widespread adoption of quantum-enabled photonic technologies.