Entanglement of mesoscopic quantum fields for quantum communications
type: Dataset
description: This thesis is concerned with different aspects of quantum information with the continuous variables of quantum states of light. Through the combination of the continuous and discrete descriptions, where the light is either described in terms of quadratures or photons, non-classical quantum states and elementary quantum information protocols have been theoretically studied and experimentally implemented. We have experimentally implemented a quantum superposition of two quasi-classical states of light, a “Schrödinger cat state”, which was used to feed a quantum phase gate. We have analysed the quality of this implementation by using a simple model of the experiment. We have then studied quantum correlations, as captured by the quantum discord, for an important class of states in quantum information. We have compared the precision of our measurements by using the classical and quantum Cramér-Rao bounds. Finally, we have theoretically studied the use of a non-deterministic quantum amplifier in quantum cryptography. This amplifier has the property to amplify quantum states without amplifying their quantum noise. Using this property, we have shown that it is possible to increase the maximum distance of transmission of a secret key, as well as the tolerance to the noise added by the quantum channel.
landing page: https://pastel.hal.science/tel-00827393
identifier: NNT: 2013PA112045
keyword: amplificateur-sans-bruit
keyword: continuous-variables
keyword: correlations-quantiques
keyword: discorde-quantique
keyword: etats-non-gaussiens
keyword: infoeu-reposemanticsdoctoralthesis
keyword: information-quantique
keyword: noiseless-amplifier
keyword: non-gaussian-states
keyword: optique-quantique
keyword: physcondcm-genphysics-physicscondensed-matter-cond-matother-cond-matother
keyword: quantum-correlations
keyword: quantum-discord
keyword: quantum-information
keyword: quantum-optics
keyword: theses
keyword: variables-continues
issued: 2026-05-10T23:29:46.145036
modified: 2026-05-10T23:29:46.145041
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Entanglement of mesoscopic quantum fields for quantum communications
type: Distribution
format: HTML
access URL: https://pastel.hal.science/tel-00827393
issued: 2026-05-10T23:29:46.147179
modified: 2026-05-10T23:29:46.118994