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Synthèse et spectroscopie cohérente de nanoparticules dopées terres rares pour les technologies optiques quantiques

Abstract : Optical quantum technologies use light to transmit data and control other quantum systems. They give radical breakthrough in the fields of ultra-secured communications, sensors beyond classical range and simulations of quantum systems. To answer these highly-demanding applications, systems with multiple quantum degrees of freedom interfaced with both light and other quantum systems are necessary. However, this kind of hybrid architecture is currently not achievable at the solid state - a technology milestone. Recently, rare earth doped crystals have been identified as a promising alternative. Indeed, in the bulk state, theses materials have extremely long optical and spin coherence times, around the mililsecond and the hour respectively. Theses unique properties have enabled remarkable quantum effects like light-matter quantum teleportation at a telecom wavelength (Nat. Photonics 2014). Transposed to the nanoscale, they could enable the construction of quantum hybrid systems capable of new functions in the field of communication, opto-electronics or metrology. The aim of the project is to develop rare earth nanostructure doped crystals with long optical and spin coherence times. Theses materials will be obtained under the form of particles with a "bottom-up" approach, giving a great flexibility of morphology, size and chemical composition. It is necessary for a fine controle of the processes involved in dephasing and the coupling to other quantum systems. Characterisation will mainly be made using high-resolution spectroscopy. This project is supported by the great experience of the IRCP in the field of rare earth doped materials for quantum technologies (PRL 2014, Nat. Phys. 2015) and especially its recent breakthrough on nanocrystals (PRL 2013).
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Alexandre Fossati. Synthèse et spectroscopie cohérente de nanoparticules dopées terres rares pour les technologies optiques quantiques. Autre. Université Paris sciences et lettres, 2019. Français. ⟨NNT : 2019PSLEC008⟩. ⟨tel-03203143⟩

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