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Related Experiment Video

Updated: Jun 10, 2026

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

Long-distance entanglement-based quantum key distribution experiment using practical detectors.

Hiroki Takesue1, Ken-Ichi Harada, Kiyoshi Tamaki

  • 1NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa, 243-0198, Japan. htakesue@will.brl.ntt.co.jp

Optics Express
|August 20, 2010
PubMed
Summary

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Researchers demonstrated entanglement-based quantum key distribution over 100 km of optical fiber using practical components. This experiment achieved a secure key rate of 0.15 bit/s, paving the way for secure communication networks.

Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Optical Communications

Background:

  • Quantum key distribution (QKD) offers information-theoretic security.
  • Previous QKD experiments faced limitations with practical sources and detectors over long distances.
  • Entanglement-based QKD is a promising avenue for secure communication.

Purpose of the Study:

  • To demonstrate a practical entanglement-based quantum key distribution (QKD) system.
  • To achieve QKD over a significant distance of 100 km of optical fiber.
  • To validate the use of practical components in a secure QKD protocol.

Main Methods:

  • Utilized a silicon-based photon-pair source for high-purity time-bin entangled photons.
  • Employed high-speed InGaAs/InP avalanche photodiodes with sinusoidal gating for single photon detection.

Related Experiment Videos

Last Updated: Jun 10, 2026

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

  • Applied a security proof that accounts for practical detector characteristics.

    • Main Results:

    • Successfully generated sifted quantum keys over 100 km of optical fiber.
    • Achieved a raw key rate of 4.8 bit/s with a 9.1% error rate.
    • Distilled secure keys at a rate of 0.15 bit/s, confirming experimental viability.

    Conclusions:

    • Entanglement-based QKD is feasible over 100 km using practical, high-performance components.
    • The developed system demonstrates a significant step towards secure, long-distance quantum communication.
    • The security proof validates the use of real-world detectors in QKD protocols.