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Naturaleza cuántica de un sistema de punto-cavidad cuántica único fuertemente acoplado
K Hennessy1, A Badolato, M Winger
1Institute of Quantum Electronics, ETH Zürich, HPT G10, 8093 Zurich, Switzerland.
Nature
|January 30, 2007
Resumen
Este estudio demuestra las correlaciones cuánticas en la electrodinámica cuántica de cavidad de estado sólido (QED) utilizando un solo punto cuántico y una nanocavidad de cristal fotónico. Esto confirma la naturaleza cuántica del sistema para el procesamiento de información cuántica.
Área de la Ciencia:
- La física cuántica es la física cuántica.
- Física del estado sólido física del estado sólido.
- La óptica es la óptica.
Sus antecedentes:
- La electrodinámica cuántica de cavidad (QED) explora las interacciones entre emisores cuánticos y campos de luz.
- El fuerte acoplamiento en QED permite tareas de procesamiento de información cuántica como el entrelazamiento.
- Los sistemas de estado sólido son deseables para tecnologías cuánticas escalables.
Objetivo del estudio:
- Para confirmar la naturaleza cuántica de un sistema cuántico de punto-cavidad en el régimen de acoplamiento fuerte.
- Para validar el uso de puntos cuánticos en la cavidad de estado sólido QED para aplicaciones de información cuántica.
- Para demostrar las correlaciones cuánticas y el entrelazamiento en un sistema de estado sólido.
Principales métodos:
- Utilizando una nanocavidad de cristal fotónico acoplada a un solo punto cuántico semiconductor.
- Observar la fotoluminiscencia y las correlaciones de fotones en condiciones de fuera de resonancia y en resonancia.
- Medir el tiempo de vida del excitón y el antiagrupamiento de fotones para confirmar el acoplamiento fuerte y el comportamiento cuántico.
Principales resultados:
- Se observó una anticorrelación cuántica única entre el modo de cavidad y la emisión de excitón de punto cuántico cuando está fuera de resonancia.
- Se logró un régimen de acoplamiento fuerte, reduciendo la vida útil del excitón de punto cuántico en 145 veces cuando está en resonancia.
- Se demostró el antiagrupamiento de fotones, confirmando la naturaleza cuántica del sistema de excitón/fotón fuertemente acoplado.
Conclusiones:
- Las correlaciones cuánticas demuestran inequívocamente la naturaleza cuántica del sistema de punto-cavidad cuántica de estado sólido.
- El estudio confirma la viabilidad del QED de cavidad de estado sólido para tareas de información cuántica.
- Este trabajo allana el camino para tecnologías cuánticas escalables utilizando puntos cuánticos de semiconductores.
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