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    Este estudio introduce un algoritmo de módulo constante de signo adaptativo (AS-CMA) para combatir las perturbaciones de polarización en fibra óptica. El nuevo método asegura una recuperación de polarización robusta para las comunicaciones cuánticas, incluso en condiciones extremas.

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    Área de la Ciencia:

    • Óptica y Fotónica.
    • La Ciencia de la Información Cuántica es la Ciencia de la Información Cuántica.
    • Ingeniería de Telecomunicaciones Ingeniería de Telecomunicaciones.

    Sus antecedentes:

    • Las fluctuaciones de polarización en los cables de fibra óptica de modo único de larga distancia interrumpen los sistemas de comunicación clásica y cuántica.
    • El mantenimiento de la integridad de la señal es crucial para la transmisión segura de datos, especialmente en la distribución cuántica de claves (QKD).

    Objetivo del estudio:

    • Desarrollar un algoritmo eficiente y de baja complejidad para la recuperación de la polarización en sistemas de fibra óptica.
    • Mejorar el rendimiento y la resistencia de los sistemas de distribución de claves cuánticas de variable continua (CV-QKD) contra las perturbaciones de polarización.

    Principales métodos:

    • Proponer un algoritmo de módulo constante de signo adaptativo (AS-CMA) con un tamaño de paso adaptativo impulsado por errores.
    • Implementación de un mecanismo de actualización de peso basado en signos para reducir la complejidad computacional en comparación con la CMA convencional.
    • Validación del algoritmo AS-CMA dentro de un sistema de distribución cuántica de claves de variable continua (CV-QKD) simulado.

    Principales resultados:

    • AS-CMA demostró una robusta recuperación de polarización bajo tasas de perturbación de polarización simuladas de hasta 10 Mrad/s sobre 25 km de fibra de modo único, con solo una disminución del 12,9% en la velocidad de la clave secreta.
    • El algoritmo mantuvo una tasa de clave secreta positiva incluso bajo perturbaciones transitorias extremas de 43 Mrad/s, simulando eventos de rayos.
    • Se logró una reducción significativa en la complejidad computacional en comparación con los métodos tradicionales de CMA.

    Conclusiones:

    • El AS-CMA ofrece una solución eficiente y de bajo costo computacional para la recuperación de la polarización en sistemas CV-QKD.
    • Este algoritmo mejora la confiabilidad y seguridad de las redes de comunicación cuántica que operan a través de enlaces de fibra óptica de larga distancia.
    • AS-CMA es prometedor para su implementación práctica en futuras infraestructuras seguras de comunicación.