PROPRIETES MAGNETIQUES ET OPTIQUES DE CRISTAUX DOPES TERRES RARES POUR L'INFORMATION QUANTIQUE

Abstract : The control of information is a competitive advantage today. Despite an intensification of the means developed to protect the data stream, it is currently not possible to exchange remotely and in a completly safe way information between two parties. However, the work of Bennett and Brassard has shown that it is possible to achieve a maximum level of security using a protocol for transmitting quantum information. This protocol is based on the use of telecom networks using quantum repeaters in place of conventional repeaters. The route studied in this thesis, carried out partly in the framework of the European Project QuRep, aims to improve knowledge on single crystals doped with rare earth ions that are good candidates for the development of quantum repeaters. Two main areas emerged: on the one hand, we tried to understand the success and limiting factors regarding the use of Nd : YSO single crystal as host for quantum memories. The objective was also to transfer the coherence from an electronic Zeeman level to the hyperfine levels. In a second step, we studied a crystal with a hyperfine structure directly accessible in optics, Er : YLF to assess its potential use for quantum memories. Among other things, we achieved the transfer of coherence from a Zeeman level to an hyperfine level with a storage time of over 300 microseconds, which allows to consider the development an on demand readout quantum memory in Nd : YSO.
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Robert Marino. PROPRIETES MAGNETIQUES ET OPTIQUES DE CRISTAUX DOPES TERRES RARES POUR L'INFORMATION QUANTIQUE. Matériaux. Université des Sciences et Technologie de Lille - Lille I, 2011. Français. ⟨pastel-00746050⟩

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