Quasiparticle dynamics in a superconducting qubit irradiated by a localized infrared source

• URL: http://arxiv.org/abs/2312.05892v1
• Date: Sun, 10 Dec 2023 14:01:14 GMT
• Title: Quasiparticle dynamics in a superconducting qubit irradiated by a localized infrared source
• Authors: Rodrigo Benevides, Maxwell Drimmer, Giacomo Bisson, Francesco Adinolfi, Uwe von L\"upke, Hugo Michiel Doeleman, Gianluigi Catelani, Yiwen Chu
• Abstract summary: We systematically study the properties of a transmon qubit under illumination by focused infrared radiation. Despite the high energy of incident photons, our observations agree well with a model of low-energy quasiparticle dynamics dominated by trapping.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: A known source of decoherence in superconducting qubits is the presence of broken Cooper pairs, or quasiparticles. These can be generated by high-energy radiation, either present in the environment or purposefully introduced, as in the case of some hybrid quantum devices. Here, we systematically study the properties of a transmon qubit under illumination by focused infrared radiation with various powers, durations, and spatial locations. Despite the high energy of incident photons, our observations agree well with a model of low-energy quasiparticle dynamics dominated by trapping. This technique can be used for understanding and potentially mitigating the effects of high-energy radiation on superconducting circuits with a variety of geometries and materials.

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