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Dispositif de distribution quantique de clé avec des
états cohérents à longueur d'onde télécom

Jérôme Lodewyck 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Optique quantique
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : Quantum key distribution enables two distant interlocutors to share a secret key. Laws of quantum physics warrant the unconditonal security of the transmitted message. Continuous variables recently applied to the field of quantum information, enable new key distribution protocols that only require standard, off-the-shelves telecom components. These components yield to the high transmission rates of fiber optics communications. We build a complete quantum key distribution system that encodes the key in gaussian modulated amplitude and phase of coherent states of light. Our system is entirely made of fiber optics components, and works at a repetition rate of 1 MHz. We measured the secret information transmitted by this device and validated this rate by implementing quantum attacks that cover all the possible channel
perturbations.
We adapted error correction and privacy amplification algorithms that produce a secret key from experimental data. Then, we desgined a set of automated software that integrate both experiment control and error correction.
This work enabled us to transmit a secret key over a 25 km long fiber with a final key rate of 1 kb/s.
Our device will be integrated to a quantum key distribution network that involves several european systems.
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Contributor : Jérôme Lodewyck <>
Submitted on : Wednesday, February 14, 2007 - 8:18:10 AM
Last modification on : Wednesday, September 16, 2020 - 5:38:34 PM
Long-term archiving on: : Friday, November 25, 2016 - 2:46:17 PM

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  • HAL Id : tel-00130680, version 2

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Jérôme Lodewyck. Dispositif de distribution quantique de clé avec des
états cohérents à longueur d'onde télécom. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2006. Français. ⟨tel-00130680v2⟩

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