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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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IR Spectrum01:19

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
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IR Spectroscopy: Molecular Vibration Overview01:24

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Infrared Quantum Information.

Daniel Carney1, Laurent Chaurette1, Dominik Neuenfeld1

  • 1Department of Physics and Astronomy University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia V6T 1Z1, Canada.

Physical Review Letters
|December 9, 2017
PubMed
Summary
This summary is machine-generated.

Soft photons and gravitons cause decoherence in particle interactions, impacting quantum information. This study computes their entanglement entropy, revealing an infrared-finite result after divergence resummation.

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Area of Science:

  • Quantum Field Theory
  • Information Theory
  • Particle Physics

Background:

  • The S matrix describes particle interactions and their outcomes.
  • Low-energy (soft) photons and gravitons play a crucial role in quantum phenomena.
  • Understanding decoherence is key to quantum information processing.

Purpose of the Study:

  • To investigate the information-theoretic properties of soft photons and gravitons within the S matrix framework.
  • To demonstrate the decohering effects of unobserved soft bosons on particle momentum superpositions.
  • To compute the entanglement entropy of these soft bosons.

Main Methods:

  • Analysis of an n-particle incoming momentum eigenstate.
  • Application of soft photon and soft graviton emission principles.
  • Utilizing the universality of gravity for graviton effects.
  • Employing decoherence to calculate entanglement entropy.
  • Resumming leading infrared divergences using the Bloch-Nordsieck method.

Main Results:

  • Unobserved soft photons decohere nearly all outgoing momentum superpositions of charged particles.
  • Soft gravitons, due to gravity's universality, decohere momentum superpositions of all hard particles.
  • The computed entanglement entropy of soft bosons is infrared-finite.

Conclusions:

  • Soft bosons significantly influence quantum information in particle interactions.
  • Decoherence induced by soft particles is a fundamental aspect of quantum field theory.
  • The infrared-finite entanglement entropy suggests a consistent description of soft boson effects.