Related papers: A superconducting on-chip microwave cavity for tunable hybrid systems with optically trapped Rydberg atoms

A superconducting on-chip microwave cavity for tunable hybrid systems with optically trapped Rydberg atoms

URL: http://arxiv.org/abs/2410.23269v1
Date: Wed, 30 Oct 2024 17:52:03 GMT
Title: A superconducting on-chip microwave cavity for tunable hybrid systems with optically trapped Rydberg atoms
Authors: Benedikt Wilde, Manuel Kaiser, Malte Reinschmidt, Andreas Günther, Dieter Koelle, Jószef Fortágh, Reinhold Kleiner, Daniel Bothner,
Abstract summary: Hybrid quantum systems are highly promising platforms for addressing challenges of quantum information science and quantum sensing. Here, we work towards a hybrid system consisting of a superconducting on-chip microwave circuit in a dilution refrigerator and optically trapped ultra-cold atoms.
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Abstract: Hybrid quantum systems are highly promising platforms for addressing important challenges of quantum information science and quantum sensing. Their implementation, however, is technologically non-trivial, since each component typically has unique experimental requirements. Here, we work towards a hybrid system consisting of a superconducting on-chip microwave circuit in a dilution refrigerator and optically trapped ultra-cold atoms. Specifically, we focus on the design optimization of a suitable superconducting chip and on the corresponding challenges and limitations. We unfold detailed microwave-cavity engineering strategies for maximized and tunable coupling rates to atomic Rydberg-Rydberg transitions in $\mathrm{^{87}Rb}$ atoms while respecting the boundary conditions due to the presence of a laser beam near the surface of the chip. Finally, we present an experimental implementation of the superconducting microwave chip and discuss the cavity characteristics as a function of temperature and applied dc voltage. Our results illuminate the required consideration aspects for a flexible, tunable superconductor-atom hybrid system, and lay the groundwork for realizing this exciting platform in a dilution refrigerator with vacuum Rabi frequencies approaching the strong-coupling regime.

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