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El ajuste de deformación de los sistemas individuales de túneles atómicos detectados por un qubit superconductor
Grigorij J Grabovskij1, Torben Peichl, Jürgen Lisenfeld
1Physikalisches Institut and Deutsche Forschungsgemeinschaft Center for Functional Nanostructures, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany.
Science (New York, N.Y.)
|October 16, 2012
Resumen
Los investigadores descubrieron que la deformación de las barreras de óxido en los qubits superconductores altera los sistemas de túnel atómico. Esta interacción se midió utilizando espectroscopia de microondas, confirmando una hipótesis clave en sólidos desordenados.
Área de la Ciencia:
- La mecánica cuántica es la mecánica cuántica.
- Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada
- Ciencia de los materiales ciencia de los materiales.
Sus antecedentes:
- Los sólidos estructuralmente desordenados exhiben sistemas de túneles atómicos responsables de las anomalías de baja temperatura.
- Estos sistemas también causan decoherencia en los qubits superconductores, particularmente dentro de las barreras de óxido de unión de Josephson.
Objetivo del estudio:
- Investigar experimentalmente el efecto de las deformaciones mínimas en los sistemas de túneles atómicos en sólidos desordenados.
- Para medir los cambios en las energías de estos sistemas utilizando qubits superconductores como sondas sensibles.
Principales métodos:
- Utilizando qubits superconductores para sondear sistemas de túneles atómicos a través de interacciones coherentes.
- Empleando la espectroscopia de microondas para medir los cambios de división de energía en los estados de túnel atómico bajo tensión externa.
- Inducir pequeñas deformaciones en la barrera de óxido de las uniones de Josephson.
Principales resultados:
- Se demostró que una deformación menor de la barrera de óxido altera de manera medible las energías de los sistemas de túneles atómicos.
- Medido con éxito estos cambios de energía mediante la observación de la respuesta del qubit a través de la espectroscopia de microondas.
- Estableció una correlación entre la tensión externa y la división de energía de los estados de túnel atómico.
Conclusiones:
- Los resultados experimentales verifican una hipótesis central del modelo de túneles de dos niveles para sólidos desordenados.
- Los qubits superconductores pueden servir como herramientas precisas para estudiar los fenómenos cuánticos en materiales desordenados.
- Comprender y controlar los sistemas de túneles atómicos es crucial para mejorar la coherencia de los qubits y explorar la física fundamental.
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