Fluctuations from edge defects in superconducting resonators.

Authors :: Neill, C.
Megrant, A.
Barends, R.
Chen, Yu
Chiaro, B.
Kelly, J.
Mutus, J. Y.
O'Malley, P. J. J.
Sank, D.
Wenner, J.
White, T. C.
Yin, Yi
Cleland, A. N.
Martinis, John M.
Source :: Applied Physics Letters. 8/12/2013, Vol. 103 Issue 7, p072601-072601-4. 1p. 1 Diagram, 1 Chart, 3 Graphs.
Publication Year :: 2013
Abstract: Superconducting resonators, used in astronomy and quantum computation, couple strongly to microscopic two-level defects. We monitor the microwave response of superconducting resonators and observe fluctuations in dissipation and resonance frequency. We present a unified model where the observed dissipative and dispersive effects can be explained as originating from a bath of fluctuating two-level systems. From these measurements, we quantify the number and distribution of the defects. [ABSTRACT FROM AUTHOR]