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Analysis of high quality superconducting resonators: consequences for TLS properties in amorphous oxides

Burnett, J; Faoro, L; Lindström, T; (2016) Analysis of high quality superconducting resonators: consequences for TLS properties in amorphous oxides. Superconductor Science and Technology , 29 (4) , Article 044008. 10.1088/0953-2048/29/4/044008. Green open access

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Abstract

1/f noise caused by microscopic two-level systems (TLS) is known to be very detrimental to the performance of superconducting quantum devices but the nature of these TLS is still poorly understood. Recent experiments with superconducting resonators indicates that interaction between TLS in the oxide at the film-substrate interface is not negligible. Here we present data on the loss and 1/f frequency noise from two different Nb resonators with and without Pt capping and discuss what conclusions can be drawn regarding the properties of TLS in amorphous oxides. We also estimate the concentration and dipole moment of the TLS.

Type: Article
Title: Analysis of high quality superconducting resonators: consequences for TLS properties in amorphous oxides
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/0953-2048/29/4/044008
Publisher version: http://dx.doi.org/10.1088/0953-2048/29/4/044008
Language: English
Additional information: Copyright © 2016 IOP Publishing Ltd. License information: CC-BY. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1476925
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