论文标题
快速可调的高Q因子超导微波谐振器
Fast tunable high Q-factor superconducting microwave resonators
论文作者
论文摘要
我们提出了由蓝宝石基板上的平面NBN制造的快速可调超导的微波谐振器。 $3λ/4 $波长的谐振器正在通过传递DC电流来调整叉形和调节，该直流电流控制着调谐叉插脚的动力电感。开放端的$λ/4 $部分作为一个集成的阻抗转换器运行，在DC端子耦合点上为微波电流创造了几乎完美的缩写，从而防止了微波炉通过DC线路泄漏。我们在整个调整范围内测量一个内部质量因子$ q _ {\ rm int}> 10 {^{5}} $。我们展示了$> 3 \％$的调整范围，调整响应时间短至20 ns，最大可实现的失调。由于准骨架设计，谐振器对高达0.5吨的磁场具有弹性。
We present fast tunable superconducting microwave resonators fabricated from planar NbN on a sapphire substrate. The $3λ/4$ wavelength resonators are tuning fork shaped and tuned by passing a dc current which controls the kinetic inductance of the tuning fork prongs. The $λ/4$ section from the open end operates as an integrated impedance converter which creates a nearly perfect short for microwave currents at the dc terminal coupling points, thus preventing microwave energy leakage through the dc lines. We measure an internal quality factor $Q_{\rm int}>10{^{5}}$ over the entire tuning range. We demonstrate a tuning range of $> 3\%$ and tuning response times as short as 20 ns for the maximum achievable detuning. Due to the quasi-fractal design, the resonators are resilient to magnetic fields of up to 0.5 T.
