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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
Published on: June 3, 2015
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Puerta cuántica universal rápida por encima del umbral de tolerancia a las fallas en silicio
Akito Noiri1, Kenta Takeda2, Takashi Nakajima2
1RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan. akito.noiri@riken.jp.
Nature
|January 20, 2022
Resumen
Los investigadores lograron puertas cuánticas de alta fidelidad en qubits de espín de silicio, superando el umbral de tolerancia a fallas. Este avance en la corrección de errores cuánticos puede permitir computadoras cuánticas de silicio escalables.
Área de la Ciencia:
- La computación cuántica
- Corrección del error cuántico
- Los qubits de estado sólido
Sus antecedentes:
- Las computadoras cuánticas tolerantes a fallos requieren la corrección de errores cuánticos.
- Los códigos de superficie son una estrategia prometedora de corrección de errores.
- Los qubits de espín de silicio ofrecen ventajas de nanofabricación pero enfrentan desafíos de fidelidad.
Objetivo del estudio:
- Para demostrar puertas de dos qubits de alta fidelidad en qubits de espín de silicio.
- Para lograr una fidelidad universal de la puerta superior al umbral de tolerancia a fallos.
- Para permitir las computadoras cuánticas de silicio escalables.
Principales métodos:
- Utilizó un control eléctrico rápido con un campo de gradiente inducido por micromagnéticos.
- Empleó un mecanismo de acoplamiento sintonizable de dos qubits.
- Identificó la velocidad óptima de rotación del qubit y la fuerza de acoplamiento para una alta fidelidad.
Principales resultados:
- Logró una fidelidad de puerta de dos qubits del 99,5%.
- Se ha demostrado una fidelidad de puerta de un solo qubit del 99,8%.
- Se ejecutaron con éxito los algoritmos de búsqueda Deutsch-Jozsa y Grover.
Conclusiones:
- La fidelidad universal de la puerta más allá del umbral de tolerancia a fallos se ha demostrado en qubits de espín de silicio.
- El control eléctrico rápido y el acoplamiento ajustable superan las limitaciones de fidelidad anteriores.
- Este avance allana el camino para la computación cuántica de silicio escalable.
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