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Related Experiment Video

Updated: Jan 19, 2026

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

Haruka Terashima1, Yoshiro Sato1, Satoshi Kobayashi1

  • 1Department of Physics, Tokyo University of Science.

Journal of Visualized Experiments : Jove
|September 24, 2019
PubMed
Summary

We developed a new source for unconditional polarization-entangled photons, offering high emission rates and broadband distribution. This breakthrough enables efficient quantum communication without postselection.

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Area of Science:

  • Quantum Optics
  • Photonics
  • Quantum Information Science

Background:

  • Entangled photons are crucial for quantum technologies.
  • Existing sources often require postselection or have limitations in efficiency and bandwidth.

Purpose of the Study:

  • To develop a high-performance source of unconditional polarization-entangled photons.
  • To achieve high-emission rates, broadband distribution, and eliminate the need for postselection.

Main Methods:

  • Utilized multiple quantum interference within a Sagnac interferometer.
  • Employed a round-trip configuration for enhanced efficiency.
  • Leveraged parametric down-conversion for photon pair generation.

Main Results:

  • Demonstrated a postselection-free source of polarization-entangled photons.
  • Achieved high generation efficiency and broadband photon distribution.
  • Experimentally verified entanglement through fidelity and Bell parameter measurements exceeding classical limits.

Conclusions:

  • The developed Sagnac interferometer-based source provides high-quality, unconditional polarization-entangled photons.
  • This source is a significant advancement for practical quantum communication and information processing.