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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Acústica cuántica con qubits superconductores

Yiwen Chu1,2, Prashanta Kharel3,2, William H Renninger3,2

  • 1Department of Applied Physics, Yale University, New Haven, CT 06511, USA. yiwen.chu@yale.edu robert.schoelkopf@yale.edu.

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Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un nuevo dispositivo electromecánico que acopla qubits superconductores a ondas acústicas de alta frecuencia. Este avance permite el control cuántico de los fonones de gigahertz a nivel cuántico único para aplicaciones de información cuántica.

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Área de la Ciencia:

  • Ciencia de la información cuántica
  • Física del estado sólido
  • Mecánica eléctrica

Sus antecedentes:

  • Los objetos mecánicos son cruciales para la información cuántica y la metrología, sirviendo como memorias o transductores cuánticos.
  • La electromecánica tiene como objetivo crear dispositivos robustos y coherentes que vinculen el movimiento a objetos cuánticos no lineales como los qubits superconductores.

Objetivo del estudio:

  • Para demostrar experimentalmente un resonador de ondas acústicas de alta frecuencia fuertemente acoplado a un qubit superconductor.
  • Para lograr el control cuántico y la medición de fonones de gigahertz en el nivel cuántico único.

Principales métodos:

  • Utilizó la transducción piezoeléctrica para acoplar un resonador de ondas acústicas masivas con un qubit superconductor.
  • Tiempos medidos de qubit y coherencia mecánica.
  • Se ha demostrado el control cuántico y la medición en fonones de gigahertz.

Principales resultados:

  • Logrado un fuerte acoplamiento con una cooperatividad de 260.
  • Tiempos medidos de qubit y coherencia mecánica de aproximadamente 10 microsegundos.
  • Mostró el acceso controlado a múltiples modos de fonón utilizando métodos de fabricación simples.

Conclusiones:

  • El dispositivo demostrado ofrece una plataforma robusta para sistemas electromecánicos cuánticos.
  • Permite el control de un solo nivel cuántico y la medición de fonones de gigahertz, avanzando las tecnologías cuánticas.
  • Destaca el potencial de la transducción piezoeléctrica para dispositivos cuánticos escalables.