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Quantitative evaluation of defect-models in superconducting phase qubits

Mon, 2011-02-14 19:01 - Daniel Rudolph
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Date: 
2010-12-20
Author(s): 

J. H. Cole, C. Müller, P. Bushev, G. J. Grabovskij, J. Lisenfeld, A. Lukashenko, A. V. Ustinov, and A. Shnirman

Reference: 

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

URL: 

http://link.aip.org/link/doi/10.1063/1.3529457

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.