高动电感超导共面波导辐射损耗的抑制
Suppression of radiation loss in high kinetic inductance superconducting co-planar waveguides
摘要：
我们提出了一种新的芯片上的实验室技术来测量非常低的损耗在超导传输线在（亚）毫米波长。该芯片由100 nm厚的NbTiN共面波导（CPW）法布里-珀罗（FP）谐振器组成，一侧耦合到天线，另一侧耦合到微波动态电感检测器。使用单频辐射源可以测量FP在350 GHz附近的频率响应并推导出其损耗。我们发现，损失占主导地位的辐射损失内的CPW线，形成FP，它随着线宽的减小和增加动力学电感的预期。可以使用SONNET模拟定量地理解结果。对于总宽度为$6\ \mathrm{μm}$的CPW观察到最低损耗，并且对应于$\approx15,000$的Q因子。
英文摘要：
We present a novel lab-on-chip technique to measure the very low losses in superconducting transmission lines at (sub-) mm wavelengths. The chips consist of a 100 nm thick NbTiN Coplanar Waveguide (CPW) Fabry Perot (FP) resonator, coupled on one side to an antenna and on the other side to a Microwave Kinetic Inductance detector. Using a single frequency radiation source allows us to measure the frequency response of the FP around 350 GHz and deduce its losses. We show that the loss is dominated by radiation loss inside the CPW line that forms the FP and that it decreases with decreasing line width and increasing kinetic inductance as expected. The results can be quantitatively understood using SONNET simulations. The lowest loss is observed for a CPW with a total width of $6\ \mathrm{μm}$ and corresponds to a Q-factor of $\approx15,000$.
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