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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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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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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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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.
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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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Una interfaz de espín-fotón coherente en silicio

X Mi1, M Benito2, S Putz1

  • 1Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.

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|February 15, 2018
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores lograron un fuerte acoplamiento entre los espines de los electrones de silicio y los fotones de microondas, lo que permite conexiones cuánticas de larga distancia. Este avance facilita la computación cuántica al permitir una conectividad escalable de todos a todos los qubits a través de fotones.

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Área de la Ciencia:

  • La computación cuántica
  • Ciencia de la información cuántica
  • Física del estado sólido

Sus antecedentes:

  • Los puntos cuánticos de silicio ofrecen largos tiempos de coherencia y escalabilidad para la computación cuántica.
  • Los métodos actuales como el acoplamiento del vecino más cercano limitan la conectividad de qubits.
  • Lograr el acoplamiento de espín-espín de larga distancia a través de fotones es crucial para los procesadores cuánticos avanzados.

Objetivo del estudio:

  • Para demostrar un fuerte y coherente acoplamiento entre los espines de un solo electrón en el silicio y los fotones de frecuencia de microondas.
  • Para superar las limitaciones de los pequeños momentos de dipolo magnético para las interacciones espín-fotón.
  • Para permitir la conectividad de todos a todos en procesadores cuánticos basados en spin.

Principales métodos:

  • Utilizando la hibridación de carga de espín en un gradiente de campo magnético para mejorar la interacción de espín-fotón.
  • Utilizando fotones de frecuencia de microondas para mediar el acoplamiento espín-espín.
  • Implementación de técnicas de control coherente y de lectura dispersiva para giros individuales.

Principales resultados:

  • Se han logrado fuertes velocidades de acoplamiento de espín-fotón superiores a 10 megahertz, significativamente más altas que los métodos anteriores.
  • Se ha demostrado el control coherente y la lectura dispersiva de los espines individuales de los electrones en el silicio.
  • Estableció un mecanismo viable para mediar las interacciones entre giros distantes.

Conclusiones:

  • El fuerte acoplamiento de espín-fotón demostrado proporciona una vía directa para enredar espines individuales utilizando fotones.
  • Esta investigación allana el camino para procesadores cuánticos escalables con conectividad entre todos los qubits.
  • Los avances en la tecnología de puntos cuánticos de silicio se aceleran, acercando la computación cuántica práctica.