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OSA Advanced Photonics Congress

Recent Progress in Security Theory of Quantum Key Distribution

Masato Koashi

Published Jan 1, 2025• 0 citations
Publisher

Abstract

Continuous-variable QKD with homodyne detection has many practical merits compared to QKD with photon detection, but proving its full security is harder. This talk will introduce recent proof techniques to improve its applicability and performance. Full-text article not available; see video presentation
DOI
10.1364/sppcom.2025.sptu1f.1

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Modern security proofs of quantum key distribution (QKD) must take finite-size effects and composable aspects into consideration. This is also the case for continuous-variable (CV) protocols, which are based on the transmission and detection of bosonic coherent states. In this paper, we refine and advance the previous theory in this area providing a more rigorous formulation for the composable key rate of a generic CV-QKD protocol. Thanks to these theoretical refinements, our general formulas allow us to prove more optimistic key rates with respect to previous literature. Published by the American Physical Society 2024