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Vers l'enregistrement d'un signal quantique dans des ions de terre rare en matrice cristalline

Abstract : This thesis relates to preliminary studies aiming to achieve quantum memories in rare earth ions doped inorganic crystals. Quantum memories are an essential element of any quantum information process. If photons are the best vectors for information transport, materials systems represent the best quantum objects to achieve inforrmation storage and manipulation. As they are insensitive to decoherence by spontaneous emission, Raman transitions are an interesting process to realize the light-matter coupling. Rare earth ions have been chosen because they exhibit relatively long coherence lifetime. In this thesis, after a detailed presentation of the different rare earth ions and the different crystals, we justify the choice of working on Thulium ions embeded in a YAG crystal. We then discuss on the possibility to create an efficient three-level system in this material with the help of an external magnetic field. We present the experimentals results of spectroscopy of Thulium ion in a magnetic field, that allow the measurement of the Thulium gyromagnetic factors. We present the three-level system preparation procedure, aiming to eliminate the transitions inhomogeneous broadening. We describe a first coherent manipulation process of a thulium ions macroscopic ensemble, with the help of an ultra-stable laser built in the lab: the population adiabatic transfer between two levels of the system, using the "Complex Hyperbolic Secant" excitation procedure.
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Contributor : Frédéric de Seze <>
Submitted on : Thursday, March 16, 2006 - 9:02:03 PM
Last modification on : Monday, February 15, 2021 - 10:37:29 AM
Long-term archiving on: : Saturday, April 3, 2010 - 10:55:59 PM


  • HAL Id : tel-00011966, version 1



Frédéric de Seze. Vers l'enregistrement d'un signal quantique dans des ions de terre rare en matrice cristalline. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00011966⟩



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