Security and performance of continuous-variable quantum key distribution systems

Abstract : This thesis focuses on a cryptographic primitive that allows two distant parties to generate an arbitrary amount of secret key even in the presence of an eavesdropper, provided that they share a short initial secret message. We focus our study on continuous-variable protocols and demonstrate experimentally an all-fiber system that performs distribution of secret keys at 80 km on a dedicated fiber link while taking into account all known imperfections. We could extract secret keys at such a distance bydesigning specific error correcting codes that perform very close to Shannon’s bound for low signal to noise ratios. We also consider side-channel attacks that are not taken into account into the system security proof and propose some countermeasures. Finally, we study our system compability with intense communication channels that propagate on the same optical fiber.
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Paul Jouguet. Security and performance of continuous-variable quantum key distribution systems. Cryptography and Security [cs.CR]. Télécom ParisTech, 2013. English. ⟨NNT : 2013ENST0048⟩. ⟨tel-01174739⟩

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