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Redes de comunicación cuántica a gran escala con fotónica integrada

Yun Zheng1, Hanyu Wang2, Xinyu Jia2,3

  • 1State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing, China. zhengyun96@pku.edu.cn.

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Resumen

Este estudio demuestra una red de distribución de claves cuánticas (QKD) de fotónica integrada escalable. El novedoso sistema permite la comunicación segura a largas distancias, allanando el camino para redes cuánticas a gran escala.

Palabras clave:
fotónica integradadistribución de claves cuánticascomunicación cuánticaredes cuánticasmicrocombseguridad cuántica

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Área de la Ciencia:

  • Comunicación y criptografía cuántica
  • Fotónica integrada
  • Redes cuánticas

Sus antecedentes:

  • La distribución de claves cuánticas (QKD) ofrece comunicaciones demostrablemente seguras, pero enfrenta desafíos para escalar a redes grandes y largas distancias.
  • Las arquitecturas de red QKD existentes, como los sistemas de nodo confiable y punto a multipunto, tienen limitaciones con respecto a los intermediarios y la distancia.
  • La distribución de claves cuánticas de campo doble (TF-QKD) mejora la distancia de comunicación, pero requiere dispositivos cuánticos escalables para la implementación de la red.

Objetivo del estudio:

  • Demostrar una red TF-QKD de fotónica integrada escalable y confiable.
  • Superar las limitaciones de las redes QKD existentes en términos de escala y distancia.
  • Establecer un camino viable hacia redes cuánticas a gran escala utilizando componentes fabricables en masa.

Principales métodos:

  • Se desarrolló una red TF-QKD de fotónica integrada con 20 chips transmisores QKD del lado del cliente y un chip de micropeine óptico del lado del servidor.
  • Se utilizó un micropeine para generar peines de frecuencia coherentes de ultrabajo ruido como semillas y referencias para los chips del cliente.
  • Se implementó QKD por pares a través de 20 chips de cliente utilizando diez canales multiplexados por longitud de onda, logrando el bloqueo de fase y la preparación de claves.

Principales resultados:

  • Se logró una capacidad de red de 3.700 km (pares de clientes × distancia de comunicación) con enlaces individuales que superan el límite sin repetidor a 370 km en fibra enrollada.
  • Se demostró la reproducibilidad a escala de oblea tanto de los chips de micropeine del lado del servidor como de los chips transmisores QKD del lado del cliente.
  • Se mostró una escalabilidad y confiabilidad excepcionales de la red TF-QKD de fotónica integrada.

Conclusiones:

  • La red TF-QKD de fotónica integrada ofrece una solución escalable y confiable para la comunicación cuántica a larga distancia.
  • La combinación de fabricabilidad en masa, rentabilidad y alta escalabilidad de la fotónica integrada es crucial para la realización de redes cuánticas a gran escala.
  • Esta demostración de prueba de concepto representa un paso significativo hacia la implementación práctica de redes cuánticas a gran escala.