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1Department of Physics, ETH Zürich, CH-8093 Zürich, Switzerland. jfink@phys.ethz.ch
Nature
|July 18, 2008
Resumen
Los investigadores proporcionan evidencia espectroscópica directa de la no linealidad cuántica en la electrodinámica cuántica de cavidad (QED) utilizando qubits superconductores. Esto confirma la naturaleza cuántica de las interacciones átomo-campo, crucial para el procesamiento de información cuántica.
Área de la Ciencia:
- La física cuántica es la física cuántica.
- La electrodinámica cuántica de la cavidad (QED)
- Sistemas cuánticos de estado sólido en estado sólido.
Sus antecedentes:
- Cavity QED tradicionalmente utiliza sistemas atómicos para estudiar la interacción entre la materia y la luz.
- La división del modo Rabi del vacío es un fenómeno clave, pero puede tener explicaciones clásicas.
- La naturaleza cuántica se sugiere mediante la escala de la fuerza de acoplamiento con el número de fotones (√n).
Objetivo del estudio:
- Para proporcionar evidencia espectroscópica directa de la no linealidad cuántica en la cavidad QED.
- Para confirmar la naturaleza mecánica cuántica de las interacciones de campo atómico resonante.
- Para explorar los estados de superposición átomo-fotón.
Principales métodos:
- Utilizó una configuración QED de circuito con un qubit superconductor en una cavidad de microondas.
- Empleó una bomba espectroscópica y la técnica de la sonda.
- Medido el grado fotónico de libertad del sistema acoplado.
Principales resultados:
- Observación espectroscópica directa de la no linealidad cuántica.
- Pruebas inequívocas de la naturaleza cuántica de la interacción de campo atómico resonante.
- Exploró estados de superposición átomo-fotón que involucran hasta dos fotones.
Conclusiones:
- Los sistemas QED de circuito demuestran un fuerte acoplamiento y largos tiempos de coherencia.
- La no linealidad observada confirma la naturaleza mecánica cuántica del sistema.
- El circuito QED ofrece una interfaz cuántica para el procesamiento y la comunicación de información cuántica.
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