Quantitative evaluation of defect-models in superconducting phase qubits

Jared H. Cole, Clemens Müller, Pavel Bushev, Grigorij J. Grabovskij, J. Lisenfeld, A. Lukashenko, A. V. Ustinov, Alexander Shnirman

Abstract

We use high-precision spectroscopy and detailed theoretical modeling to determine the form of the coupling between a superconducting phase qubit and a two-level defect. Fitting the experimental data with our theoretical model allows us to determine all relevant system parameters. We observe a strong qubit-defect coupling with a nearly vanishing longitudinal component. We quantitatively compare several existing theoretical models for the microscopic origin of two-level defects.

Locations

• Applied Physics Letters - View
• arXiv (Cornell University) - View - PDF
• DataCite API - View