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Spin–Spin Coupling Constant: Overview01:08

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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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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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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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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...
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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
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Simulación Cuántica Digital del Transporte de Espín

Yi-Ting Lee1, Bibek Pokharel2,3, Jeffrey Cohn3,4

  • 1University of Illinois at Urbana-Champaign, Department of Materials Science and Engineering, Urbana, Illinois 61801, USA.

Physical review letters
|February 22, 2026
PubMed
Resumen

Los investigadores simularon de manera confiable el transporte cuántico de espín utilizando funciones de autocorrelación de corriente de espín en un dispositivo de qubits superconductores. Este avance permite el estudio directo de fenómenos de transporte cuántico, superando las limitaciones previas.

Palabras clave:
simulación cuánticatransporte de espínqubits superconductoresfunciones de autocorrelación de corriente de espínfenómenos de transporte cuántico

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Área de la Ciencia:

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

Sus antecedentes:

  • Los sistemas de espín cuántico son cruciales para dispositivos espintrónicos y computación cuántica.
  • La sondeo del transporte de espín utiliza tradicionalmente funciones de autocorrelación espín-espín (ACF).
  • La ACF de corriente de espín ofrece información de transporte más directa pero es computacionalmente costosa.

Objetivo del estudio:

  • Demostrar la simulación cuántica digital confiable del transporte de espín a través de la ACF de corriente de espín.
  • Superar el alto costo de puerta asociado con métodos previos.
  • Investigar fenómenos de transporte en un modelo de Heisenberg XXZ 1D de 40 sitios.

Principales métodos:

  • Se utilizó un dispositivo transmon basado en qubits superconductores para la simulación cuántica.
  • Se empleó un esquema de medición directa utilizando operaciones no unitarias y mediciones de mitad de circuito.
  • Se superaron las limitaciones de los esquemas de medición indirecta como la prueba de Hadamard.

Principales resultados:

  • Se simuló con éxito el transporte de espín a través de la ACF de corriente de espín en simulación cuántica digital pre-falla.
  • Se observó el escalamiento de Kardar-Parisi-Zhang en el régimen superdifusivo.
  • Se confirmó la anulación del peso de Drude en el régimen difusivo.

Conclusiones:

  • La simulación cuántica digital pre-falla es una herramienta viable para estudiar fenómenos de transporte cuántico.
  • Los esquemas de medición directa con mediciones de mitad de circuito son efectivos para sondear el transporte de espín.
  • El estudio proporciona nuevas perspectivas sobre los regímenes de transporte del modelo de Heisenberg XXZ 1D.