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Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
Atomic Nuclei: Nuclear Magnetic Moment00:59

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Updated: Jul 17, 2026

Quasi-light Storage for Optical Data Packets
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Memoria cuántica nanofotónica de tierras raras con recuperación controlada ópticamente

Tian Zhong1, Jonathan M Kindem1, John G Bartholomew1

  • 1T. J. Watson Laboratory of Applied Physics, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA.

Science (New York, N.Y.)
|September 2, 2017
PubMed
Resumen

Los investigadores desarrollaron una memoria cuántica nanofotónica de alta fidelidad utilizando neodimio y una cavidad de cristal fotónico. Este dispositivo de estado sólido permite el almacenamiento eficiente de qubits y la lectura controlada, crucial para el avance de las redes cuánticas.

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Área de la Ciencia:

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

Sus antecedentes:

  • Las redes cuánticas requieren una memoria cuántica confiable para la distribución del entrelazamiento.
  • El almacenamiento de qubits en chip con lectura controlada es clave para los nodos de red cuántica escalables.
  • Los conjuntos de neodimio acoplados a las cavidades ofrecen potencial para memorias cuánticas de alto rendimiento.

Objetivo del estudio:

  • Para demostrar una memoria cuántica nanofotónica de alta fidelidad.
  • Para lograr una inicialización eficiente y una lectura selectiva del tiempo de los qubits.
  • Desarrollar una memoria de estado sólido integrable para nodos de red cuántica.

Principales métodos:

  • Acoplamiento de un conjunto de neodimio mesoscópico a una nanocavidad de cristal fotónico.
  • Utilizando la nanocavidad para una polarización de espín >95% y una inicialización eficiente.
  • Empleando un cambio óptico Stark mejorado para la lectura selectiva de los estados de frecuencia atómica.

Principales resultados:

  • Demostró una memoria cuántica nanofotónica de alta fidelidad.
  • Se ha logrado una polarización de espín eficiente (>95%) para la inicialización de la memoria.
  • Habilitado la lectura selectiva del cubo de tiempo a través del control óptico de cambio Stark.

Conclusiones:

  • La memoria cuántica de estado sólido desarrollada es altamente eficiente y controlable.
  • Esta memoria es integrable con otros dispositivos a escala de chip para el procesamiento de información cuántica.
  • La tecnología avanza en el desarrollo de nodos de red cuántica escalables.