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Related Concept Videos

Conservation of Angular Momentum01:09

Conservation of Angular Momentum

A system's total angular momentum remains constant if the net external torque acting on the system is zero. Considering a system that consists of n tiny particles, the angular momentum of any tiny particle may change, but the system's total angular momentum would remain constant. The principle of conservation of angular momentum only considers the net external torque acting on the system. While there are internal forces exerted by different particles within the system that also produce internal...
Conservation of Angular Momentum: Application01:18

Conservation of Angular Momentum: Application

A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a change...
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Angular Momentum about an Arbitrary Axis01:11

Angular Momentum about an Arbitrary Axis

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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

Quantum correlations in optical angle-orbital angular momentum variables.

Jonathan Leach1, Barry Jack, Jacqui Romero

  • 1Department of Physics and Astronomy, Scottish Universities Physics Alliance (SUPA), University of Glasgow, Glasgow, G12 8QQ, UK.

Science (New York, N.Y.)
|August 7, 2010
PubMed
Summary
This summary is machine-generated.

Quantum entanglement between two photons shows strong correlations in angular position and orbital angular momentum. These quantum correlations exceed classical limits, suggesting new quantum information applications.

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Published on: May 30, 2014

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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

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Area of Science:

  • Quantum mechanics
  • Quantum information science

Background:

  • Entanglement is a fundamental quantum phenomenon.
  • Entanglement is a key resource for quantum information science.

Purpose of the Study:

  • Demonstrate Einstein, Podolsky, and Rosen (EPR) correlations.
  • Investigate entanglement between angular position and orbital angular momentum of photons.

Main Methods:

  • Spontaneous parametric down-conversion (SPDC) process.
  • Nonlinear optical process to create entangled photon pairs.

Main Results:

  • Observed strong EPR correlations between angular position and orbital angular momentum.
  • Correlations are an order of magnitude stronger than classical limits imposed by the uncertainty principle.

Conclusions:

  • Angular position and orbital angular momentum entanglement exhibit unique properties.
  • These properties may lead to significant applications in quantum information science.