Author:
Sixto Xoel,Currás-Lorenzo Guillermo,Tamaki Kiyoshi,Curty Marcos
Abstract
AbstractDecoy-state quantum key distribution (QKD) is undoubtedly the most efficient solution to handle multi-photon signals emitted by laser sources, and provides the same secret key rate scaling as ideal single-photon sources. It requires, however, that the phase of each emitted pulse is uniformly random. This might be difficult to guarantee in practice, due to inevitable device imperfections and/or the use of an external phase modulator for phase randomization in an active setup, which limits the possible selected phases to a finite set. Here, we investigate the security of decoy-state QKD when the phase is actively randomized by faulty devices, and show that this technique is quite robust to deviations from the ideal uniformly random scenario. For this, we combine a novel parameter estimation technique based on semi-definite programming, with the use of basis mismatched events, to tightly estimate the parameters that determine the achievable secret key rate. In doing so, we demonstrate that our analysis can significantly outperform previous results that address more restricted scenarios.
Funder
Spanish Ministry of Economy and Competitiveness
Fondo Europeo de Desarrollo Regional
Spanish Ministry of Science and Innovation
Galician Regional Government
European Union’s Horizon Europe Framework Programme
JSPS Postdoctoral Fellowships
JSPS KAKENHI
Cisco Systems Inc.
European Union NextGenerationEU
Publisher
Springer Science and Business Media LLC
Subject
Electrical and Electronic Engineering,Condensed Matter Physics,Atomic and Molecular Physics, and Optics,Control and Systems Engineering
Cited by
2 articles.
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