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

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.

15 pages, 11 figures

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• Theory of quasiparticle generation by microwave drives in superconducting qubits
• Concurrent Fermionic Simulation Gate
• A superconducting on-chip microwave cavity for tunable hybrid systems with optically trapped Rydberg atoms
• Low-loss Material for Infrared Protection of Cryogenic Quantum Applications
• Ab initio modeling of nonequilibrium dynamics in superconducting detectors and qubits