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Algorithme de réconciliation et méthodes de distribution quantique de clés adaptées au domaine fréquentiel

Abstract : Despite being long regarded as merely an amusement for researchers, quantum cryptography has now been accepted has a viable solution for secure communications. In fact, the fundamental laws of quantum mechanics guarantee the unconditional security of the distributed secret keys.

We proposed a quantum key distribution system based on single-photons, exploiting genuine frequency-coded quantum states. This new coding technique removes the need for interferometric devices and therefore offers high intrinsic robustness. We implemented a system based on integrated off-the-shelf optical devices and validated the coding technique. We then investigated a system based on continuous variables, in which information is encoded in the amplitude and phase of coherent states. The proposed setup is based on frequency multiplexing of the information signal with a local oscillator.

The communication rates achievable by quantum key distribution systems are not only limited by technological constraints, but also by the efficiency of the reconciliation protocols. We developed an efficient reconciliation algorithm for continuous variables based on LDPC codes, which enables high-rate key distributions with continuous variable protocols.
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Contributor : Matthieu Bloch <>
Submitted on : Thursday, January 10, 2008 - 4:31:05 PM
Last modification on : Thursday, February 25, 2021 - 10:24:02 AM
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  • HAL Id : tel-00203634, version 1


Matthieu Bloch. Algorithme de réconciliation et méthodes de distribution quantique de clés adaptées au domaine fréquentiel. domain_other. Université de Franche-Comté, 2006. Français. ⟨tel-00203634⟩



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