Reducing Frequency Scatter in Large Arrays of Superconducting Resonators with Inductor Line Width Control
Reducing Frequency Scatter in Large Arrays of Superconducting Resonators with Inductor Line Width Control
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DOI：
10.1007/s10909-022-02893-8
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发表时间：
2022-11
影响因子：
2
通讯作者：
J. Li;P. Barry;Z. Pan;C. Albert;T. Cecil;C. L. Chang;K. Dibert;M. Lisovenko;V. Yefremenko
中科院分区：
文献类型：
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作者：
J. Li;P. Barry;Z. Pan;C. Albert;T. Cecil;C. L. Chang;K. Dibert;M. Lisovenko;V. Yefremenko
超导谐振器现在被发现在需要对低能量信号进行高保真测量的广泛应用中。几乎所有这些应用的一个共同特点是需要增加谐振器数量以进一步提高灵敏度，同时还需要限制低温读出通道和复杂性。与初始设计相比，电流谐振器阵列的主要限制之一是在谐振器频率上观察到的散射。在这里，我们介绍了最近的进展，以确定一个主要的潜在原因的谐振器散射-电感线宽波动。我们设计并制作了集总元件谐振器阵列，其中电感线宽从1.8到0.1的步长变化。电感的定义是使用电子束光刻来探测和量化共振频率的系统变化。与两种不同的电容器几何结构配对，谐振器显示出分别为30 MHz和30 MHz的线性频率间隔，或分数频移()。这种线性关系与我们的理论预测相符。我们的结果表明，如果电感线宽变化得到充分控制，谐振器阵列的频率散射很容易实现。
Superconducting resonators are now found in a broad range of applications that require high-fidelity measurement of low-energy signals. A common feature across almost all of these applications is the need for an increased number of resonators to further improve sensitivity, combined with the desire to limit cryogenic readout channels and complexity. One of the major limitations of current resonator arrays is the observed scatter in the resonator frequencies when compared to the initial design. Here we present recent progress toward identifying one of the dominant underlying causes of resonator scatter - inductor line width fluctuation. We designed and fabricated an array of lumped-element resonators in which the inductor line width changes from 1.8toin steps of 0.1. The inductor is defined using electron-beam lithography to probe and quantify the systematic variation of resonance frequencies. Paired with two different capacitor geometries the resonators showed a linear frequency spacing ofand 30 MHz, respectively, orandin fractional frequency shift (). This linear relationship matches our theoretical prediction. Our result demonstrates significant improvement in resonator array frequency scatter is readily achievable if inductor line width variation is sufficiently controlled.