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A semiempirical model for two-level system noise in superconducting microresonators

Appl. Phys. Lett. 92, 212504 (2008); doi:10.1063/1.2937855

Published 29 May 2008

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Jiansong Gao,1 Miguel Daal,2 John M. Martinis,3 Anastasios Vayonakis,1 Jonas Zmuidzinas,1 Bernard Sadoulet,2 Benjamin A. Mazin,4 Peter K. Day,4 and Henry G. Leduc4
1Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, California 91125, USA
2Physics Department, University of California at Berkeley, Berkeley, California 94720, USA
3Department of Physics, University of California, Santa Barbara, California 93106, USA
4Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA
We present measurements of the low-temperature excess frequency noise of four niobium superconducting coplanar waveguide microresonators, with center strip widths sr ranging from 3  to  20  µm. For a fixed internal power, we find that the frequency noise decreases rapidly with increasing center strip width, scaling as 1/s<sub>r</sub><sup>1.6</sup>. We show that this geometrical scaling is readily explained by a simple semiempirical model which assumes a surface distribution of independent two-level system fluctuators. These results allow the resonator geometry to be optimized for minimum noise. ©2008 American Institute of Physics
History: Received 2 April 2008; accepted 9 May 2008; published 29 May 2008
Permalink: http://link.aip.org/link/?APPLAB/92/212504/1
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KEYWORDS and PACS

Keywords
PACS
  • 85.25.Am
    Superconducting device characterization, design, and modeling
  • 84.40.Az
    Waveguides, transmission lines, striplines
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (13)
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