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Related Concept Videos

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

The de Broglie Wavelength

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...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...
The Uncertainty Principle04:08

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Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He mathematically...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Nonmonotonic quantum-to-classical transition in multiparticle interference.

Young-Sik Ra1, Malte C Tichy, Hyang-Tag Lim

  • 1Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.

Proceedings of the National Academy of Sciences of the United States of America
|January 9, 2013
PubMed
Summary
This summary is machine-generated.

Quantum mechanics shows that particle distinguishability affects interference. Contrary to expectations, interference patterns in multi-particle systems do not always fade monotonically with increasing distinguishability, revealing complex quantum behavior.

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Last Updated: May 15, 2026

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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

Area of Science:

  • Quantum Mechanics
  • Quantum Optics
  • Many-Body Physics

Background:

  • Wave-particle duality dictates that probability distributions of detection events exhibit wave-like interference.
  • Single-particle interference (self-interference) is observed for photons and massive particles when which-way information is unavailable.
  • Many-particle quantum features manifest in correlation functions for indistinguishable particles.

Purpose of the Study:

  • To investigate the behavior of quantum interference in multi-particle systems as particle distinguishability changes.
  • To challenge the assumption of monotonic fading of interference with increasing distinguishability.
  • To explore the nonmonotonic nature of quantum-to-classical transitions in multi-particle interference.

Main Methods:

  • Experimental demonstration of multi-particle interference with controlled particle distinguishability.
  • Theoretical modeling to explain the observed interference phenomena.
  • Analysis of interference signals as a function of particle distinguishability.

Main Results:

  • Demonstrated that the monotonic decrease of quantum interference with increasing distinguishability is not universally true for more than two interfering particles.
  • Observed nonmonotonic interference signals as particle distinguishability is continuously increased.
  • Showed that different numbers of particles effectively interfere, leading to complex interference patterns.

Conclusions:

  • The quantum-to-classical transition in multi-particle interference is generally nonmonotonic.
  • This finding provides new perspectives for experimentally characterizing many-particle coherence.
  • The study sheds light on the intricate processes of decoherence in complex quantum systems.