Beams Document 5462-v1

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Superconducting Microwave Resonators for High Gradients and Quantum Applications

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Phil Adamson
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Phil Adamson
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25 May 2017, 16:56
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25 May 2017, 16:56
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31 May 2017, 11:56
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Superconducting microwave cavities are devices that allow the electromagnetic field to resonate in their inner volume at a specific frequency with very low losses, reaching extremely high quality factors. Because of such low losses, superconducting cavities are usually deployed as accelerating elements in modern particle accelerators, especially when continuous wave or high duty cycle operation is required. The high quality factor of such resonators is also attractive to other fields, especially where controlled electromagnetic environments are required, as in quantum applications and cavity quantum electrodynamics (cQED) experiments. In the present seminar, I will discuss the limitations in terms of maximum achievable gradient of such superconducting devices, with particular focus on the understanding of the quench phenomenon. Some possible strategies to further improve the maximum accelerating gradient will be presented and compared with the current available experimental data. The concept of layered superconducting structures at the rf surface of the resonator as a way to delay the cavity quench will be also presented and discussed thoughtfully. The second part of the presentation will be instead reserved to discuss innovative applications of superconducting microwave cavities, and in particular their employment in quantum computing to improve the promising cQED architecture. With the scope of showing how basic SRF studies for accelerators can actually be applicable also in the field of quantum information, I will present the full description of the vortex dissipation in rf and microwave regimes, since it represents an important dissipation mechanism of superconducting resonators at high gradients, but also a source of decoherence in qubits.
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Mattia Checchin talk
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