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NMR Spectroscopy: Spin–Spin Coupling01:08

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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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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.
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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Detección de líquidos de espín topológicos en un simulador cuántico programable

G Semeghini1, H Levine1, A Keesling1,2

  • 1Department of Physics, Harvard University, Cambridge, MA 02138, USA.

Science (New York, N.Y.)
|December 2, 2021
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores exploraron los estados líquidos de espín cuántico utilizando un simulador cuántico programable. Este avance permite el estudio experimental de la materia topológica y la computación cuántica robusta.

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Área de la Ciencia:

  • Física de la materia condensada
  • Ciencia de la información cuántica

Sus antecedentes:

  • Los líquidos de espín cuántico son fases exóticas de la materia caracterizadas por el orden topológico y el entrelazamiento cuántico de largo alcance.
  • Estas propiedades los convierten en candidatos prometedores para la realización de la computación cuántica tolerante a fallos.

Objetivo del estudio:

  • Para sondear experimentalmente los estados líquidos de espín cuántico utilizando un nuevo enfoque de simulación cuántica.
  • Para detectar el orden topológico y las correlaciones cuánticas características de estas fases.

Principales métodos:

  • Utilizó un simulador cuántico programable de 219 átomos con átomos dispuestos en una red de kagome.
  • Diseñaron estados cuánticos frustrados a través del bloqueo de Rydberg, lo que lleva a la ausencia de orden local.
  • Operadores de cadena topológicos empleados para identificar firmas de líquido de espín cuántico.

Principales resultados:

  • Creado y detectado con éxito una fase líquida de espín cuántico del tipo de código tórico.
  • Firmas directas observadas de orden topológico y correlaciones cuánticas de largo alcance.
  • Demostró la capacidad de sondear materia topológica en un entorno experimental controlado.

Conclusiones:

  • El enfoque experimental permite la exploración controlada de la materia topológica.
  • Este trabajo allana el camino para desarrollar el procesamiento protegido de la información cuántica.