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Updated: Feb 14, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Continuous-Variable Triple-Photon States Quantum Entanglement.

E A Rojas González1,2, A Borne3,4, B Boulanger4

  • 1Centre de Nanosciences et de Nanotechnologies CNRS/Université Paris-Saclay, 91460 Marcoussis, France.

Physical Review Letters
|February 14, 2018
PubMed
Summary
This summary is machine-generated.

We explored quantum entanglement in three-photon states. Genuine triple-photon entanglement was absent in spontaneous generation but robustly present in the fully seeded case.

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Area of Science:

  • Quantum optics
  • Nonlinear optics
  • Quantum information

Background:

  • Second-order nonlinear optical processes are well-understood for quantum entanglement.
  • Third-order nonlinear optical interactions present unique challenges and opportunities for quantum entanglement.

Purpose of the Study:

  • To investigate quantum entanglement in three-photon states generated via third-order nonlinear optical interactions.
  • To compare entanglement properties between spontaneous and seeded triple-photon generation.

Main Methods:

  • Analysis of three-photon states generated through phase-matched third-order nonlinear optical processes.
  • Investigation of quantum entanglement in the quadratures of the three modes.
  • Comparison of spontaneous parametric triple-photon generation with a fully seeded approach.

Main Results:

  • Absence of quantum entanglement between the quadratures in spontaneous parametric triple-photon generation.
  • Demonstration of robust, seeding-dependent, genuine triple-photon entanglement in the fully seeded case.

Conclusions:

  • Third-order nonlinear optical interactions can generate genuine triple-photon entanglement.
  • Seeding is crucial for achieving robust triple-photon entanglement in these systems.