Modelling dielectric loss in superconducting resonators: Evidence for
interacting atomic two-level systems at the Nb/oxide interface
- URL: http://arxiv.org/abs/2203.05054v3
- Date: Sat, 29 Oct 2022 16:12:17 GMT
- Title: Modelling dielectric loss in superconducting resonators: Evidence for
interacting atomic two-level systems at the Nb/oxide interface
- Authors: N. Gorgichuk, T. Junginger, R. de Sousa
- Abstract summary: Two-level system defects in amorphous surfaces/interfaces are responsible for energy relaxation in superconducting resonators and qubits.
Here a model that interpolates between the interacting and noninteracting TLS loss tangent is proposed to perform numerical analysis of experimental data.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: While several experiments claim that two-level system (TLS) defects in
amorphous surfaces/interfaces are responsible for energy relaxation in
superconducting resonators and qubits, none can provide quantitative
explanation of their data in terms of the conventional noninteracting TLS
model. Here a model that interpolates between the interacting and
noninteracting TLS loss tangent is proposed to perform numerical analysis of
experimental data and extract information about TLS parameters and their
distribution. As a proof of principle, the model is applied to TESLA cavities
that contain only a single lossy material in their interior, the
niobium/niobium oxide interface. The best fits show interacting TLSs with a
sharp modulus of electric dipole moment for both thin (5 nm) and thick (100 nm)
oxides, indicating that the TLSs are "atomic" instead of "glassy". The proposed
method can be applied to other devices with multiple material interfaces and
substrates, with the goal of elucidating the nature of TLSs causing energy loss
in resonators and qubits.
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