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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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Las correlaciones de Bell en un condensado de Bose-Einstein

Roman Schmied1, Jean-Daniel Bancal2, Baptiste Allard1

  • 1Quantum Atom Optics Laboratory, Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland.

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|April 23, 2016
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Resumen
Este resumen es generado por máquina.

Los investigadores detectaron correlaciones de Bell más fuertes que el entrelazamiento en un condensado de Bose-Einstein de 480 átomos. Esto demuestra que las correlaciones cuánticas más fuertes son experimentalmente accesibles en sistemas de muchos cuerpos.

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Área de la Ciencia:

  • Física Cuántica
  • Física atómica
  • Física de la materia condensada

Sus antecedentes:

  • Caracterizar las correlaciones cuánticas es crucial para comprender los sistemas de muchos cuerpos.
  • El entrelazamiento es una correlación cuántica bien conocida, pero pueden existir formas más fuertes.
  • Los condensados de Bose-Einstein proporcionan una plataforma para el estudio de los fenómenos cuánticos.

Objetivo del estudio:

  • Para detectar y caracterizar las correlaciones de Bell, una forma más fuerte de correlación cuántica, en un sistema de muchos cuerpos.
  • Demostrar la accesibilidad experimental de las correlaciones no clásicas más fuertes posibles.

Principales métodos:

  • Derivación de un testigo de correlación de Bell de una desigualdad de Bell de muchas partículas.
  • Medición de las correlaciones de espín en un condensado de Bose-Einstein de aproximadamente 480 átomos.
  • Utilizando un estado de giro comprimido para una mayor sensibilidad.

Principales resultados:

  • Detección de las correlaciones de Bell entre los espines atómicos en el condensado de Bose-Einstein.
  • La medición excedió el umbral de correlación de Bell en 3,8 desviaciones estándar.
  • Las correlaciones observadas fueron más fuertes que el entrelazamiento típico.

Conclusiones:

  • Las correlaciones de Bell son experimentalmente accesibles en sistemas de muchos cuerpos.
  • Las mediciones colectivas pueden revelar estas fuertes correlaciones no clásicas.
  • Esto abre nuevas vías para explorar los fenómenos cuánticos en sistemas cuánticos macroscópicos.