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El entrelazamiento multipartito distribuido espacialmente permite la dirección EPR de las nubes atómicas

Philipp Kunkel¹, Maximilian Prüfer², Helmut Strobel²

¹Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany. steering@matterwave.de.

Science (New York, N.Y.)

|April 28, 2018

Resumen

Generamos y distribuimos espacialmente el entrelazamiento en átomos ultrafríos usando la mezcla de espín. Esto confirmó un verdadero entrelazamiento multipartito y demostró la dirección de Einstein-Podolsky-Rosen en sistemas cuánticos distribuidos.

Área de la Ciencia:

La física cuántica
Física atómica
Ciencias de la información cuántica

Sus antecedentes:

El entrelazamiento entre modos separados espacialmente es crucial para los protocolos distribuidos mejorados cuánticamente.
La generación robusta y la detección de este entrelazamiento en sistemas atómicos ultrafríos presentan desafíos significativos.

Objetivo del estudio:

Para generar y distribuir espacialmente el entrelazamiento en un sistema atómico ultrafrío.
Confirmar experimentalmente el verdadero entrelazamiento multipartito y demostrar correlaciones cuánticas.

Principales métodos:

Utilizó la mezcla de espín en un condensado de Bose-Einstein confinado para crear un estado entrelazado.
Empleó la expansión auto-similar de la nube atómica para distribuir el entrelazamiento espacialmente.
Aplicó una lectura de espín con resolución espacial para detectar correlaciones cuánticas.

Principales resultados:

Generó con éxito un estado entrelazado de partículas indistinguibles dentro de un solo modo espacial.
Distribución espacial demostrada del entrelazamiento a través de la expansión de la nube atómica.
Se observó una fuerte dirección de Einstein-Podolsky-Rosen (EPR) entre partes distintas de la nube.
Confirmado verdadero enredo de 5 partes usando un testigo basado en la dirección EPR.

Conclusiones:

Desarrolló un método para generar y distribuir entrelazamiento en átomos ultrafríos.
Se mostró la dirección EPR como una herramienta poderosa para verificar el entrelazamiento de múltiples partes en sistemas separados espacialmente.
Abrió el camino para robustos protocolos cuánticos distribuidos usando plataformas atómicas ultrafrías.

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