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

被引：141

作者：

Gao, Jiansong ^{[1
]}

Daal, Miguel ^{[2
]}

Martinis, John M. ^{[3
]}

Vayonakis, Anastasios ^{[1
]}

Zmuidzinas, Jonas ^{[1
]}

Sadoulet, Bernard ^{[2
]}

Mazin, Benjamin A. ^{[4
]}

Day, Peter K. ^{[4
]}

Leduc, Henry G. ^{[4
]}

机构：

[1] CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA

[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[3] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[4] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 21期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

Coplanar waveguides - Mathematical models - Resonators - Superconducting devices;

D O I：

10.1063/1.2937855

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present measurements of the low-temperature excess frequency noise of four niobium superconducting coplanar waveguide microresonators, with center strip widths s(r) ranging from 3 to 20 mu m. For a fixed internal power, we find that the frequency noise decreases rapidly with increasing center strip width, scaling as 1/s(r)(1.6). 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. (c) 2008 American Institute of Physics.

引用

页数：3