Journal article
Stability of superconducting resonators: Motional narrowing and the role of Landau-Zener driving of two-level defects
D Niepce, JJ Burnett, M Kudra, JH Cole, J Bylander
Science Advances | AMER ASSOC ADVANCEMENT SCIENCE | Published : 2021
Abstract
Frequency instability of superconducting resonators and qubits leads to dephasing and time-varying energy loss and hinders quantum processor tune-up. Its main source is dielectric noise originating in surface oxides. Thorough noise studies are needed to develop a comprehensive understanding and mitigation strategy of these fluctuations. We use a frequency-locked loop to track the resonant frequency jitter of three different resonator types—one niobium nitride superinductor, one aluminum coplanar waveguide, and one aluminum cavity—and we observe notably similar random telegraph signal fluctuations. At low microwave drive power, the resonators exhibit multiple, unstable frequency positions, wh..
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Grants
Awarded by Horizon 2020 Framework Programme
Funding Acknowledgements
This research has been supported by funding from the Swedish Research Council, Chalmers Area of Advance Nanotechnology, and the Wallenberg Center for Quantum Technology (WACQT). J.H.C. is supported by the Australian Research Council Centre of Excellence program through grant number CE170100026 and the Australian National Computational Infrastructure facility. J.J.B. acknowledges financial support from the Industrial Strategy Challenge Fund Metrology Fellowship as part of the UK government's Department for Business, Energy and Industrial Strategy. J.B. acknowledges funding from the EU Flagship on Quantum Technology H2020-FETFLAG-2018-03 project 820363 OpenSuperQ.