Fluctuations From Edge Defects in Superconducting Resonators

A. Megrant; A. N. Cleland; B. Chiaro; C. Neill; D. Sank; J. Kelly; John M. Martinis; J. Wenner; J. Y. Mutus; P. J. J. O'Malley

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Fluctuations From Edge Defects in Superconducting Resonators

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arxiv 1306.3718 v1 pith:BC537PQT submitted 2013-06-17 cond-mat.mes-hall

C. Neill , A. Megrant , R. Barends , Yu Chen , B. Chiaro , J. Kelly , J. Y. Mutus , P. J. J. O'Malley

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D. Sank J. Wenner T. C. White Yi Yin A. N. Cleland John M. Martinis

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classification cond-mat.mes-hall

keywords defectsresonatorssuperconductingfluctuationstwo-levelastronomybathcomputation

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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.

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