Manipulation d'états quantiques de la lumière par l'intermédiaire d'un atome de Rydberg unique

Abstract : The manipulation of non-classical states is of great interest both from a fundamental perspective but also for their potential applications in domains such as quantum information, quantum communication or metrology. It is then essential to be able to prepare quantum systems in such states and control their evolution. The field of cavity quantum electrodynamics is very well suited to study non-classical states of light. It relies on the strong coupling of a two-level system on one side and one mode of the electromagnetic field on the other side. This thesis introduces a new experiment of cavity quantum electrodynamics combining a beam of slow atoms prepared in Rydberg circular states and the electromagnetic mode of a superconducting cavity. This new set-up allows us to improve significantly the interaction time between the atom and the field. Thanks to this, we obtained our first experimental results that we are presenting in this manuscript. Firstly, we use the resonant interaction between the atom and the field to generate a Schrödinger cat state, superposition of two coherent field of opposite phases. This field is then characterized thanks to its Rabi oscillation signal. Secondly, we make use of the long interaction time in the dispersive regime to achieve a resolution of the dressed state spectrum of the system up to 8 photons. Thanks to this resolution we were finally able to engineer quantum states such as the superposition of 0 and 2 photons.
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Submitted on : Monday, August 19, 2019 - 5:51:52 PM
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Frédéric Assémat. Manipulation d'états quantiques de la lumière par l'intermédiaire d'un atome de Rydberg unique. Physique Quantique [quant-ph]. Sorbonne Université, 2019. Français. ⟨tel-02267802⟩

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