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Setting Limits on Supersymmetry Using Simplified Models
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Estados cuánticos macroscópicos entrelazados en dos qubits superconductores.

A J Berkley1, H Xu, R C Ramos

  • 1Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742, USA. berkley@physics.umd.edu

Science (New York, N.Y.)
|May 17, 2003
PubMed
Resumen

Los investigadores crearon estados cuánticos macroscópicos entrelazados en dos qubits de unión de Josephson. Esto demuestra el entrelazamiento a una distancia de 0,7 milímetros, controlado por corrientes de sesgo y confirmado por espectroscopia de microondas.

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Área de la Ciencia:

  • La física cuántica es la física cuántica.
  • Circuitos superconductores en los circuitos superconductores.

Sus antecedentes:

  • Los qubits de unión de Josephson son unidades fundamentales en la computación cuántica.
  • El control de las interacciones entre los qubits es crucial para crear estados entrelazados.

Objetivo del estudio:

  • Para demostrar la creación de estados cuánticos macroscópicos entrelazados en qubits acoplados de unión de Josephson.
  • Para investigar el control de las interacciones de qubits utilizando corrientes de sesgo.

Principales métodos:

  • Utilizó dos qubits de unión de Josephson con sesgo de corriente acoplados a través de un condensador.
  • Empleado espectroscopia de microondas (4-6 GHz) a 20 millikelvin para sondear los niveles de energía.
  • Corrientes de sesgo de uniones individuales variadas para controlar las interacciones de qubits y la resonancia.

Principales resultados:

  • La evidencia espectroscópica confirmó la creación de estados cuánticos macroscópicos entrelazados.
  • Los niveles de energía observados coincidían estrechamente con las predicciones teóricas para los estados entrelazados.
  • Los estados entrelazados se mantuvieron a lo largo de una separación espacial de 0,7 milímetros entre los qubits.

Conclusiones:

  • Se ha demostrado con éxito el entrelazamiento en sistemas cuánticos macroscópicos separados espacialmente.
  • El control de corriente de sesgo ofrece un método viable para ajustar las interacciones de los qubits y lograr el entrelazamiento.
  • Los hallazgos apoyan la escalabilidad de los qubits superconductores para el procesamiento de información cuántica.