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            <title xml:lang="en">Manipulation of light pulses in real time for the generation of quantum states, and study of applications to quantum computing</title>
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            <idno type="halRefHtml">Optique [physics.optics]. Université Paris-Saclay, 2022. Français. &lt;a target="_blank" href="https://www.theses.fr/2022UPASP133"&gt;&amp;#x27E8;NNT : 2022UPASP133&amp;#x27E9;&lt;/a&gt;</idno>
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                <authority type="jury">Pascale Senellart [Président]</authority>
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                <term xml:lang="en">Continuous variables</term>
                <term xml:lang="en">Entanglement</term>
                <term xml:lang="en">Quantum memory</term>
                <term xml:lang="en">Optical Schrödinger's cat states</term>
                <term xml:lang="en">Quantum optics</term>
                <term xml:lang="en">Quantum information</term>
                <term xml:lang="fr">Intrication</term>
                <term xml:lang="fr">Variables continues</term>
                <term xml:lang="fr">Mémoire quantique</term>
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                <term xml:lang="fr">Optique quantique</term>
                <term xml:lang="fr">Information quantique</term>
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              <p>This thesis work is about implementing growing protocols using quantum memory cavities to generate complex photonic states and implement quantum operations. A large part of this work focuses on the building up of a high rate source of "optical Schrödinger cat" states (quantum superposition of two coherent states with opposite phases). These states underlie multiple protocols in quantum information and calculus (some of them are studied in this thesis). This is the reason why the development of such reliable and quick sources is so interesting.We present here a first experiment, using our growing protocol, leading to the generation of such states with a high production rate, easily improvable for reaching the order of ten kilohertz. Furthermore, we stored the generated states in a quantum memory, which is a world's first. This could lead to future experiments, such as the generation of more complex states or the realization of quantum information/calculus protocols (especially protocols based on continuous variables).</p>
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              <p>Ce travail de thèse porte sur l'implémentation de protocoles de croissance, à l'aide de mémoires quantiques en cavité, pour générer des états photoniques quantiques complexes et implémenter des opérations quantiques. Une grande partie de ce travail est consacrée, en particulier, à la fabrication d'une source rapide d'états « chat de Schrödinger optique » (superposition quantique d'états cohérents en opposition de phase). Ces états sont à la base de nombreux protocoles en information et calcul quantique (dont certains sont étudiés dans le cadre de ce travail). C'est la raison pour laquelle développer des sources fiables et rapides de ce genre d'état est aussi intéressant.Nous présentons une première preuve expérimentale de principe de notre protocole avec la génération de tels états à un taux de production élevé, grandement améliorable et optimisable pour atteindre la dizaine de kilohertz. En plus de générer ces états, nous les avons stockés dans une mémoire quantique, ce qui n'avait encore jamais été réalisé. Cela permet d'envisager leur utilisation dans de futures expériences pour générer des états plus complexes ou dans des protocoles de calcul quantique, en particulier des protocoles utilisant des variables continues.</p>
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