Journal article
Quantitative evaluation of defect-models in superconducting phase qubits
JH Cole, C Müller, P Bushev, GJ Grabovskij, J Lisenfeld, A Lukashenko, AV Ustinov, A Shnirman
Applied Physics Letters | AMER INST PHYSICS | Published : 2010
DOI: 10.1063/1.3529457
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. © 2010 American Institute of Physics.
Grants
Awarded by Michigan Institute for Data Science, University of Michigan
Funding Acknowledgements
We would like to thank M. Ansmann and J. M. Martinis (UCSB) for providing us with the sample used in this work. This work was supported by the CFN of DFG; the EU projects EuroSQIP, MIDAS, and SOLID; and the U.S. ARO under Contract No. W911NF-09-1-0336.