Published May 26, 2008
| Version public
Journal Article
Open
A semiempirical model for two-level system noise in superconducting microresonators
Creators
-
1.
California Institute of Technology
-
2.
University of California, Berkeley
-
3.
University of California, Santa Barbara
-
4.
Jet Propulsion Lab
Abstract
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/sr1.6. 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.
Additional Information
©2008 American Institute of Physics. Received 2 April 2008; accepted 9 May 2008; published 29 May 2008. We thank Clare Yu and Sunil Golwala for useful discussions. The device was fabricated in the University of California, Berkeley, Microfabrication Laboratory. This work was supported in part by the NASA, NSF, JPL, and the Gordon and Betty Moore Foundation.Files
GAOapl08b.pdf
Additional details
Identifiers
- Eprint ID
- 10666
- Resolver ID
- CaltechAUTHORS:GAOapl08b
Dates
- Created
-
2008-06-02Created from EPrint's datestamp field
- Updated
-
2021-11-08Created from EPrint's last_modified field
Caltech Custom Metadata
- Caltech groups
- Physics Department