Security Proof for Quantum Key Distribution Using Qudit Systems

preprint2011arXivOpen access

Abstract

We provide security bounds against coherent attacks for two families of quantum key distribution protocols that use dd-dimensional quantum systems. In the asymptotic regime, both the secret key rate for fixed noise and the robustness to noise increase with dd. The finite-key corrections are found to be almost insensitive to d≲20d\lesssim 20.

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