Security proof for quantum key distribution using qudit systems
Lana Sheridan, Valerio Scarani · Physical Review A · 2010
We provide security bounds against coherent attacks for two families of quantum key distribution protocols that use $d$-dimensional quantum systems. In the asymptotic regime, both the secret key rate for fixed noise and the robustness to noise increase with $d$. The finite key corrections are found to be almost insensitive to $d\ensuremath{\lesssim}20$.