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This research establishes a unified formalism for optimizing the entire processing chain in entanglement-based quantum key distribution protocols. By analyzing interactions between quantum preprocessing, measurements, and classical postprocessing, the study quantifies how noisy states impact final secure key rates and determines optimal measurement bases for Werner states. These findings directly advance the theoretical limits of Quantum Comms by refining strategies for generating secure cryptographic keys from imperfect entangled links.
Processing Entangled Links Into Secure Cryptographic Keys
arXiv:2511.18913v3 Announce Type: replace Abstract: The following paper presents a holistic approach to the processing of entangled links within entanglement based quantum key distribution protocols, whose security relies on the Bell inequality. We investigate the interactions, and the collective impact, of the whole processing chain on the final secure key rate. This includes the quantum mechanical preprocessing in the form of entanglement distillation, processing of the entangled states via measurements and the necessary classical postprocessing based on the measurement results. Our investigations are based on the principle idea of the Eckert 1991 protocol and utilize the secret key capacity introduced by Devetak and Winter in 2005. Our results include a proof on what measurement bases need to be chosen to achieve this capacity for the case of Werner states. It also presents a new processing strategy and compares it with the most common one that can be found within the literature. Furthermore, it answers the question on how much entanglement distillation is optimal. By doing so we propose a unified formalism, describing the whole processing chain, that can be used to make quantitative statements on the relation between the quality and quantity of entangled but noisy quantum states used for generating secure keys.
Abstract:The following paper presents a holistic approach to the processing of entangled links within entanglement based quantum key distribution protocols, whose security relies on the Bell inequality. We investigate the interactions, and the collective impact, of the whole processing chain on the final secure key rate. This includes the quantum mechanical preprocessing in the form of entanglement distillation, processing of the entangled states via measurements and the necessary classical postprocessing based on the measurement results. Our investigations are based on the principle idea of the Eckert 1991 protocol and utilize the secret key capacity introduced by Devetak and Winter in 2005. Our results include a proof on what measurement bases need to be chosen to achieve this capacity for the case of Werner states. It also presents a new processing strategy and compares it with the most common one that can be found within the literature. Furthermore, it answers the question on how much entanglement distillation is optimal. By doing so we propose a unified formalism, describing the whole processing chain, that can be used to make quantitative statements on the relation between the quality and quantity of entangled but noisy quantum states used for generating secure keys.
arXiv:2511.18913 [quant-ph]
(or arXiv:2511.18913v3 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2511.18913 Focus to learn more arXiv-issued DOI via DataCite
IEEE Journal on Selected Areas in Communications, vol. 44, pp. 5299-5310, 2026
https://doi.org/10.1109/JSAC.2026.3707822 Focus to learn more DOI(s) linking to related resources
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