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<dc:title xml:lang="fr">Entanglement generation and quantum gates with quantum emitters in a cavity</dc:title>
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<dc:subject xml:lang="fr">Informatique quantique</dc:subject>
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<dc:subject xml:lang="fr">Génération d’intrication</dc:subject>
<dc:subject xml:lang="fr">Portes quantiques multi-qubits</dc:subject>
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<dc:subject xml:lang="fr">Atomes neutres</dc:subject>
<dc:subject xml:lang="en">Quantum computing</dc:subject>
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<dc:subject xml:lang="en">Entanglement generation</dc:subject>
<dc:subject xml:lang="en">Multi-qubit quantum gates</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse présente de nouveaux protocoles pour les portes quantiques multi-qubits non locales et la génération d’intrication dans des systèmes où plusieurs émetteurs quantiques interagissent avec un mode bosonique partagé. Elle introduit les portes de phase géométrique et adiabatique, avec des expressions analytiques de l’infidélité dépendant du nombre de qubits et de la coopérativité. Pour deux qubits, elles forment un ensemble universel, tandis que dans les systèmes multi-qubits, elles permettent des portes déterministes pour la simulation quantique et la correction d’erreurs. Une contribution majeure est un protocole de détection optimisé par l’intrication, atteignant une haute précision de mesure grâce au contrôle optimal. La thèse explore aussi un mécanisme de blocage polaritonique en cavité pour la génération d’états W non locaux et de portes multi-qubits. Ces opérations déterministes, basées sur des excitations classiques de cavité et parfois des impulsions globales, offrent une base évolutive pour l’informatique quantique, la détection quantique et l'internet quantique de demain, en particulier pour les systèmes à atomes neutres.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis presents novel protocols for non-local multi-qubit quantum gates and entanglement generation in systems where multiple quantum emitters interact with a shared bosonic mode. It introduces the Geometric and Adiabatic Phase Gates, with closed-form infidelity expressions scaling with qubit number and cooperativity. For two qubits, these form a universal gate set, while in multi-qubit systems, they enable deterministic gates for quantum simulation and quantum error correction. A key contribution is an entanglement-enhanced sensing protocol that achieves high measurement precision via optimal control. The thesis also examines a cavity polariton blockade mechanism for non-local W-state generation and multi-qubit gates. These deterministic multi-qubit operations rely only on classical cavity drives and, in some cases, global qubit pulses, providing a scalable foundation for quantum computing, sensing, and the future quantum internet, especially for neutral atom systems.</dcterms:abstract>
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