Suppression of low-frequency charge noise in superconducting resonators by surface spin desorption

S. E. de Graaf (), L. Faoro, J. Burnett, A. A. Adamyan, A. Ya. Tzalenchuk, S. E. Kubatkin, T. Lindström and A. V. Danilov
Additional contact information
S. E. de Graaf: National Physical Laboratory
L. Faoro: Universites Paris 6 et 7
J. Burnett: Chalmers University of Technology
A. A. Adamyan: Chalmers University of Technology
A. Ya. Tzalenchuk: National Physical Laboratory
S. E. Kubatkin: Chalmers University of Technology
T. Lindström: National Physical Laboratory
A. V. Danilov: Chalmers University of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract Noise and decoherence due to spurious two-level systems located at material interfaces are long-standing issues for solid-state quantum devices. Efforts to mitigate the effects of two-level systems have been hampered by a lack of knowledge about their chemical and physical nature. Here, by combining dielectric loss, frequency noise and on-chip electron spin resonance measurements in superconducting resonators, we demonstrate that desorption of surface spins is accompanied by an almost tenfold reduction in the charge-induced frequency noise in the resonators. These measurements provide experimental evidence that simultaneously reveals the chemical signatures of adsorbed magnetic moments and highlights their role in generating charge noise in solid-state quantum devices.

Date: 2018
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DOI: 10.1038/s41467-018-03577-2

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