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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Interference and Superposition of Waves01:07

Interference and Superposition of Waves

When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
The de Broglie Wavelength02:32

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
Sound Waves: Interference00:53

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
The Wave Nature of Light02:12

The Wave Nature of Light

The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.

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Updated: Jun 21, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Classical analogues of two-photon quantum interference.

R Kaltenbaek1, J Lavoie, K J Resch

  • 1Institute for Quantum Computing and Department of Physics & Astronomy, University of Waterloo, Waterloo, Canada, N2L 3G1.

Physical Review Letters
|August 8, 2009
PubMed
Summary
This summary is machine-generated.

Chirped-pulse interferometry (CPI) demonstrates classical analogues of quantum Hong-Ou-Mandel (HOM) effects. This breakthrough enables phase super-resolution with extended coherence length, mimicking quantum entanglement benefits in classical systems.

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Related Experiment Videos

Last Updated: Jun 21, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

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

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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 optics
  • Classical optics
  • Metrology

Background:

  • Quantum Hong-Ou-Mandel (HOM) interferometry is foundational for quantum interference effects.
  • Chirped-pulse interferometry (CPI) offers metrological advantages.
  • Classical systems often lack the precision of quantum counterparts.

Purpose of the Study:

  • To demonstrate classical analogues of HOM interferometry using CPI.
  • To observe classical HOM peak and quantum beating phenomena.
  • To develop a new classical technique for phase super-resolution.

Main Methods:

  • Modification of HOM interferometers for CPI.
  • Implementation of chirped-pulse techniques.
  • Analysis of interference patterns and coherence properties.

Main Results:

  • First observation of classical analogues to the HOM peak and quantum beating.
  • Demonstration of a new classical phase super-resolution technique.
  • Achieved coherence length dramatically longer than the laser light's.

Conclusions:

  • CPI can capture metrological advantages of quantum HOM interferometry classically.
  • The developed technique offers enhanced phase super-resolution.
  • This work bridges quantum phenomena with classical optical metrology.