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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: 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...
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,...
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.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Sound Waves: Interference00:53

Sound Waves: Interference

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...
Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences01:20

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences

Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and refractory oxide ion...

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Published on: September 5, 2019

Detecting entanglement in spatial interference.

Clemens Gneiting1, Klaus Hornberger

  • 1Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Strasse 38, 01187 Dresden, Germany.

Physical Review Letters
|June 25, 2011
PubMed
Summary
This summary is machine-generated.

We found that specific two-particle states exhibit nonlocal spatial interference. A new separability criterion, based on modular variables, is violated by these non-Gaussian states, offering insights into quantum phenomena.

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Last Updated: May 31, 2026

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Area of Science:

  • Quantum mechanics
  • Quantum information
  • Quantum optics

Background:

  • Nonlocal spatial interference is a key quantum phenomenon.
  • Understanding the conditions for non-Gaussian states is crucial for quantum technologies.
  • Bipartite interference phenomena are fundamental to quantum mechanics.

Purpose of the Study:

  • To identify an experimentally accessible class of two-particle states exhibiting nonlocal spatial interference.
  • To derive a separability criterion for these states using modular variables.
  • To demonstrate the violation of this criterion by non-Gaussian states.

Main Methods:

  • Utilizing the concept of modular variables.
  • Deriving a separability criterion for two-particle states.
  • Analyzing non-Gaussian states of free-moving material particles.

Main Results:

  • Identified experimentally amenable two-particle states leading to nonlocal spatial interference.
  • Derived a separability criterion violated by these specific non-Gaussian states.
  • Demonstrated the applicability of results to various bipartite interference phenomena.

Conclusions:

  • The derived separability criterion is violated by non-Gaussian states exhibiting nonlocal interference.
  • The findings are applicable beyond material particles to any pair of canonically conjugate continuous variable observables.
  • This work provides a framework for understanding and potentially engineering bipartite interference phenomena.