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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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Related Experiment Video

Updated: May 28, 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

Entanglement and classical polarization states.

Xiao-Feng Qian1, J H Eberly

  • 1Rochester Theory Center and the Department of Physics & Astronomy University of Rochester, Rochester, New York 14627, USA. xfqian@pas.rochester.edu

Optics Letters
|October 18, 2011
PubMed
Summary
This summary is machine-generated.

Classical light fields demonstrate nonquantum entanglement, a phenomenon previously thought to be exclusive to quantum mechanics. This finding introduces a new measure for the degree of polarization applicable to all optical fields.

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Related Experiment Videos

Last Updated: May 28, 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

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

Area of Science:

  • Optics and Photonics
  • Quantum Information Theory

Background:

  • Entanglement is a key feature of quantum mechanics.
  • Classical light fields possess polarization properties.

Purpose of the Study:

  • To identify classical light fields as physical examples of nonquantum entanglement.
  • To introduce a natural measure for the degree of polarization.

Main Methods:

  • Identification of classical light fields exhibiting entanglement-like properties.
  • Development of a polarization measure derived from this identification.

Main Results:

  • Classical light fields are shown to be physical instances of nonquantum entanglement.
  • A natural degree of polarization measure is established.

Conclusions:

  • The concept of entanglement can be extended to classical optics.
  • The proposed degree of polarization measure is broadly applicable to optical fields.