Quantitative evaluation of defect-models in superconducting phase qubits

Details Quantitative evaluation of defect-models in superconducting phase qubits Quantitative evaluation of defect-models in superconducting phase qubits

2010-10-28

arxiv.org/abs/1010.6037v1

Appl. Phys. Lett. 97, 252501 (2010)

Physics

Condensed Matter

Superconductivity

3 pages, 2 figures. Supplementary material, lclimits_supp.pdf

Scientific paper

10.1063/1.3529457

We use high-precision spectroscopy and detailed theoretical modelling 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. A strong qubit-defect coupling is observed, with a nearly vanishing longitudinal component. Using these estimates, we quantitatively compare several existing theoretical models for the microscopic origin of two-level defects.

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