Browsing by Author "Sawada, Kei Braz"
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Item High-dimensional decoy-state quantum key distribution over 1.3 km of installed optical fiber.(Universidad de Concepción, 2025) Sawada, Kei Braz; Moreira Lima, Gustavo de AquinoHD-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.