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Related Concept Videos

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...
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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.
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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.
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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...
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...
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Interference effects induced by non-local spatial filtering.

S P Walborn1, P H Souto Ribeiro, C H Monken

  • 1Instituto de Física, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil. swalborn@if.ufrj.br

Optics Express
|September 22, 2011
PubMed
Summary
This summary is machine-generated.

Spatial correlations of down-converted photons enable non-local spatial filtering. Counter-intuitively, increased filtering can decrease interference fringe visibility with non-Gaussian pump beams due to photon entanglement.

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Area of Science:

  • Quantum Optics
  • Photonics
  • Quantum Information Science

Background:

  • Spatial correlations in down-converted photons enable non-local spatial filtering.
  • This technique allows for control over interference fringes, ghost imaging, and quantum image retrieval.

Purpose of the Study:

  • To theoretically investigate the effects of non-local spatial filtering on interference fringe visibility.
  • To explore counter-intuitive phenomena arising from non-Gaussian pump beam profiles.

Main Methods:

  • Theoretical analysis of spatial correlations between down-converted photons.
  • Investigation of non-local spatial filtering with non-Gaussian pump beam profiles.
  • Examination of transverse spatial parity entanglement.

Main Results:

  • Non-local spatial filtering can lead to decreased interference fringe visibility with non-Gaussian pump beams.
  • This effect is contrary to observations with Gaussian beams.
  • Transverse spatial parity entanglement explains this counter-intuitive behavior.

Conclusions:

  • Non-local spatial filtering offers novel control over quantum optical phenomena.
  • The spatial profile of the pump beam significantly influences filtering outcomes.
  • Photon entanglement is key to understanding these complex quantum correlations.