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Paper detail

Quantitative evaluation of defect-models in superconducting phase qubits

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.

preprint2010arXivOpen access
J. H. ColeC. MüllerP. BushevG. J. GrabovskijJ. LisenfeldA. LukashenkoA. V. UstinovA. Shnirman
cond-mat.mes-hallcond-mat.supr-conquant-ph
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J. H. ColeC. MüllerP. BushevG. J. GrabovskijJ. LisenfeldA. LukashenkoA. V. UstinovA. Shnirman

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