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Towards strong coupling of strontium to a miniature ring cavity

  • Pöpplau, Torben
Publication Date
Dec 12, 2019
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The exploration of entangled states with large atom numbers and their application represents one of the most dynamic fields of research of contemporary atomic, molecular, and optical physics. Many different experimental techniques have emerged over the past decades to study entangled system. Cold atoms trapped in vacuum have proven to be a powerful venue for the manipulation of such systems. Among the plethora of different experimental platforms, the field of cavity quantum electrodynamics (cQED) provides versatile tools to engineer long-range interactions as well as the possibility to perform tomography of atomic quantum states via non-destructive measurements.More specifically, this thesis reports on the conception and construction of a new ultracold alkaline-earth atom experiment for the fast and reliable loading of a miniaturized cavity. For this purpose, a compact vacuum system including an efficient atomic beam source were designed and set up. The key feature ofthis new apparatus will be the integration of an optical ring resonator, which enables the generation of entangled atomic states via atom-light interactions and nondestructive detection of the atomic state.In addition to the set-up of the new experiment, a prototype of the final ring cavity was studied, demonstrating the shortest open ring cavity to date. Besides its compactness, the cavity compensates for the intrinsic astigmatism of ring cavities. For this purpose, an elliptical mirror structure has been fabricated on a fiber tip using a focused CO2-laser

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