E Scarano, E K Arvidsson, A K Roos, E Holmgren, D B Haviland
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引用次数: 0
摘要
我们研究了几种由具有大动能电感的超导铌钛氮薄膜蜿蜒纳米线制成的微波谐振器的响应,这些谐振器具有不同的电路拓扑结构以及与传输线的耦合。反射测量揭示了电路参数,并分析了它们在 1.7-6 K 范围内的温度依赖性,从而提取出超导能隙和临界温度。在我们感兴趣的频率范围内有效的叠加元件 LC 谐振器使我们能够预测准粒子 (QP) 对内部损耗的贡献,而与电路拓扑和特性阻抗无关。我们的分析表明,内部品质因数并非受限于热平衡 QP,而是内部微波损耗的另一个随温度变化的来源。
Temperature dependence of microwave losses in lumped-element resonators made from superconducting nanowires with high kinetic inductance
We study the response of several microwave resonators made from superconducting NbTiN thin-film meandering nanowires with large kinetic inductance, having different circuit topology and coupling to the transmission line. Reflection measurements reveal the parameters of the circuit and analysis of their temperature dependence in the range 1.7–6 K extract the superconducting energy gap and critical temperature. The lumped-element LC resonator, valid in our frequency range of interest, allows us to predict the quasiparticle (QP) contribution to internal loss, independent of circuit topology and characteristic impedance. Our analysis shows that the internal quality factor is limited not by thermal-equilibrium QP, but an additional temperature-dependent source of internal microwave loss.