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Distribution of Molecular Speeds

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Related Experiment Video

Updated: Jun 21, 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

Efficient entanglement distribution over 200 kilometers.

J F Dynes1, H Takesue, Z L Yuan

  • 1Toshiba Research Europe Limited, Cambridge Research Laboratory, Cambridge CB4 0GZ, UK. james.dynes@crl.toshiba.co.uk

Optics Express
|July 8, 2009
PubMed
Summary
This summary is machine-generated.

Researchers demonstrated entanglement distribution over 200 km using practical avalanche photodiodes (APDs) for secure communication. This breakthrough makes ultra-long-distance quantum communication feasible and practical.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Published on: June 8, 2018

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Last Updated: Jun 21, 2026

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

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Published on: September 5, 2019

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06:42

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Area of Science:

  • Quantum communication
  • Quantum entanglement
  • Photonics

Background:

  • Previous entanglement distribution schemes faced limitations in distance and practicality.
  • High-fidelity entanglement distribution is crucial for secure quantum communication.

Purpose of the Study:

  • To demonstrate entanglement distribution over a record distance of 200 km.
  • To showcase the use of practical avalanche photodiodes (APDs) for entanglement distribution.
  • To assess the feasibility of secure communication using this method.

Main Methods:

  • Utilized a reliable parametric down-conversion source.
  • Employed self-differencing mode avalanche photodiodes (APDs) for single photon detection.
  • Achieved high single photon detection efficiency with electrical cooling.

Main Results:

  • Successfully distributed entanglement over a record 200 km distance with sufficient fidelity.
  • Demonstrated the practicality and possibility of ultra-long-distance entanglement distribution.
  • APDs proved to be low-cost, compact, and easy to operate.

Conclusions:

  • Entanglement distribution over ultra-long distances is now both possible and practical.
  • The developed system offers a promising outlook for real-world entanglement-based communication.
  • This advancement paves the way for secure communication between distant parties.