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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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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...
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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 one, the...
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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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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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Enredo estabilizado de forma autónoma entre dos bits cuánticos superconductores.

S Shankar1, M Hatridge1, Z Leghtas1

  • 1Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA.

Nature
|November 26, 2013
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores estabilizaron un estado de Bell enredado en un sistema superconductor de dos qubits utilizando retroalimentación autónoma. Este avance avanza en la corrección de errores cuánticos y el desarrollo de computadoras cuánticas a gran escala.

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Área de la Ciencia:

  • La computación cuántica es la computación cuántica.
  • Ciencias de la información cuántica Ciencias de la información cuántica.
  • Física de la materia condensada Física de la materia condensada

Sus antecedentes:

  • La corrección de error cuántico es crucial para las computadoras cuánticas escalables.
  • Estabilizar los estados cuánticos contra la decoherencia es un desafío clave.
  • Los métodos anteriores se basaban en la retroalimentación basada en la medición.

Objetivo del estudio:

  • Para demostrar la estabilización de un estado de Bell enredado en un sistema superconductor de dos qubits.
  • Desarrollar un esquema de retroalimentación autónomo para la estabilización del estado cuántico.
  • Proporcionar un bloque de construcción para la corrección de errores cuánticos.

Principales métodos:

  • Utilizó un esquema de retroalimentación autónomo con accionamiento continuo.
  • Diseñó un acoplamiento específico entre un registro de dos qubits y un depósito disipatorio.
  • Dissipación de ingeniería apalancada para contrarrestar la decoherencia.

Principales resultados:

  • Estabilizó con éxito un estado de Bell entrelazado de dos qubits superconductores durante una duración arbitraria.
  • El esquema de retroalimentación autónoma integró el bucle de retroalimentación en el Hamiltoniano.
  • El estado estacionario del sistema era un estado de Bell, esencial para el procesamiento de información cuántica.

Conclusiones:

  • Los esquemas de retroalimentación autónoma ofrecen un nuevo enfoque para la corrección de errores cuánticos.
  • La disipación de ingeniería elimina la necesidad de complejos circuitos de retroalimentación externos.
  • Esta técnica es ampliamente aplicable a varios sistemas cuánticos, allanando el camino para la computación cuántica robusta.