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Theses

Spins individuels dans le diamant pour l'information quantique

Abstract : The principle of quantum information relies on processing information, not from a classical point of view but from a quantum one, in order to increase the efficiency of some computer algorithms. Fulfilling such a goal requires the construction of a quantum register, for instance by coherently putting together a large number of individual quantum systems which play the role of quantum information bits. In this respect, a lot of research has focused on the NV colored center of diamond as it constitutes one of the few systems which can be used as a solid-state quantum bit at room temperature. This doctoral thesis studies the interactions between the NV electronic spin and surrounding nuclear spins located in the diamond matrix, with the intention of creating diamond quantum hybrid systems. We first explain how the NV electronic spin can be used to detect nuclear spins dispersed inside the diamond. Then, we use the NV center as an ancillary quantum bit to initialize the state of these nuclear spins, either by benefitting from a level-anticrossing, or by implementing a projective measurement. Finally, we analyse the origins of the limitation of the coherence time of NV centers in ultrapure diamond samples caused by the interaction with a surrounding nuclear spin bath. Besides their interest for quantum information processing, the study and control of spins in diamond also open the path to making highly sensitive nano-sensors, for which applications can be found in numerous fields of modern physics.
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Anaïs Dréau. Spins individuels dans le diamant pour l'information quantique. Physique Quantique [quant-ph]. École normale supérieure de Cachan - ENS Cachan, 2013. Français. ⟨NNT : 2013DENS0055⟩. ⟨tel-01156590⟩

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