A semiempirical model for two-level system noise in superconducting microresonators
A semiempirical model for two-level system noise in superconducting microresonators
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DOI：
10.1063/1.2937855
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发表时间：
2008-05-26
影响因子：
4
通讯作者：
Leduc, Henry G.
中科院分区：
文献类型：
--
作者：
Gao, Jiansong;Daal, Miguel;Leduc, Henry G.
我们对四个铌超导共面波导微谐振器的低温超频噪声进行了测量，中心带宽度 s(r) 范围为 3 至 20 μm。对于固定的内部功率，我们发现频率噪声随着中心带宽度的增加而迅速减小，缩放比例为 1/s(r)(1.6)。我们表明，这种几何尺度很容易通过一个简单的半经验模型来解释，该模型假设独立的两级系统波动器的表面分布。这些结果允许优化谐振器几何形状以最小化噪声。 (c) 2008 年美国物理研究所。
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.