High-dimensional decoy-state quantum key distribution over 1.3 km of installed optical fiber.
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Date
2025
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Universidad de Concepción
Abstract
HD-QKD (distribución cuántica de claves en altas dimensiones) es una alternativa a la QKD (distribución cuántica de claves) bidimensional con ventajas como una mayor transmisión de datos por pulso [54] y tolerancia al ruido [13, 66]. Se ha demostrado que las MCFs (fibras ópticas multi-núcleo) son una plataforma viable para realizar HD-QKD mediante codificación de fase entre los modos de la misma fibra [10]. Las MCFs también han atraído la atención de ingenieros debido a su mayor tasa de transmisión de datos y es probable que se conviertan en parte de la infraestructura de telecomunicaciones en el futuro [35, 50, 14, 51]. En esta tesis, presentamos un experimento de prueba de concepto de HD-QKD, ocupando BB84 con decoy states (estados señuelo), con una configuración de fibra óptica que utiliza 4C-MCFs (fibras ópticas de cuatro núcleos) en un ambiente realista. Presentamos la teoría de QKD y las motivaciones para los decoy states, así como los límites de seguridad para sistemas de diferentes dimensiones. Describimos el experimento en detalle, incluyendo la estabilización de fase activa, la preparación del estado, las tecnologías basadas en MCF, los canales y el sistema de detección. Reportamos una tasa de transmisión máxima de corto alcance de 7,8 kbit/s y una distancia máxima de transmisión de 107 km, así como una estabilidad de corto alcance de más de 16 horas. Se presenta una comparación de nuestro experimento con varios otros, demostrando que nuestros resultados son comparables a los de otros trabajos con tecnología de detección similar. También incluimos dos artículos donde utilizamos nuestra plataforma experimental para experimentos en que simulamos ruido no markoviano e implementamos tomografía de estado cuántico con una configuración, lo que demuestra la flexibilidad de nuestra plataforma y el potencial para futuros trabajos.
HD-QKD(high-dimensional quantum key distribution) is an alternative to two-dimensional QKD with advantages such as higher data transmission per pulse [54] and noise tolerance [13, 66]. It has been shown that MCFs (multicore fibers) are a viable platform for performing HD-QKD through phase encoding across modes of the same fiber [10]. MCFs have also gathered attention due to their increased data transmission rates and are likely to become part of classical telecom infrastructure in the future [35, 50, 14, 51]. In this thesis we report a proof-of-concept decoy-state BB84 HD-QKDexperiment with an all-fiber setup using installed 4C-MCFs (four core multicore fibers) in a realistic environment. We introduce the theory of QKDand the motivations for decoy states as well as the security bounds for systems with different dimensions. We describe the experiment in detail, including active phase stabilization, state preparation, MCF-based technologies, channels and the detection system. We report a maximum short-range key rate of 7.8 kbit/s and a maximum secure key transmission distance of 105 km, as well as a short-range stability of over 16 hours. A comparison of our experiment with several others is provided, showing that our results are comparable to other works with similar detection technology. Wealso include two papers where we used our experimental platform for experiments simulating non-Markovian noise and implementing single setting quantum state tomography, showing the flexibility of our setup and potential for further work.
HD-QKD(high-dimensional quantum key distribution) is an alternative to two-dimensional QKD with advantages such as higher data transmission per pulse [54] and noise tolerance [13, 66]. It has been shown that MCFs (multicore fibers) are a viable platform for performing HD-QKD through phase encoding across modes of the same fiber [10]. MCFs have also gathered attention due to their increased data transmission rates and are likely to become part of classical telecom infrastructure in the future [35, 50, 14, 51]. In this thesis we report a proof-of-concept decoy-state BB84 HD-QKDexperiment with an all-fiber setup using installed 4C-MCFs (four core multicore fibers) in a realistic environment. We introduce the theory of QKDand the motivations for decoy states as well as the security bounds for systems with different dimensions. We describe the experiment in detail, including active phase stabilization, state preparation, MCF-based technologies, channels and the detection system. We report a maximum short-range key rate of 7.8 kbit/s and a maximum secure key transmission distance of 105 km, as well as a short-range stability of over 16 hours. A comparison of our experiment with several others is provided, showing that our results are comparable to other works with similar detection technology. Wealso include two papers where we used our experimental platform for experiments simulating non-Markovian noise and implementing single setting quantum state tomography, showing the flexibility of our setup and potential for further work.
Description
Tesis presentada para optar al grado de Doctor en Ciencias Físicas
Keywords
Fibras ópticas, Sistemas de transmisión de datos, Telecomunicaciones