Fluctuations From Edge Defects in Superconducting Resonators
C. Neill, A. Megrant, R. Barends, Yu Chen, B. Chiaro, J. Kelly, J. Y., Mutus, P. J. J. O'Malley, D. Sank, J. Wenner, T. C. White, Yi Yin, A. N., Cleland, John M. Martinis
TL;DR
This paper investigates how microscopic two-level defects cause fluctuations in superconducting resonators' dissipation and resonance frequency, providing a unified model and quantifying defect characteristics.
Contribution
It introduces a unified model explaining fluctuations in superconducting resonators due to two-level defects and quantifies defect properties from microwave response measurements.
Findings
Fluctuations in dissipation and resonance frequency are observed.
A unified model explains these fluctuations via a bath of two-level systems.
Quantification of defect number and distribution is achieved.
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.
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