论文标题
用于超导剂量量子台的NB膜的准片光谱，传输和磁性
Quasiparticle spectroscopy, transport, and magnetic properties of Nb films used in superconducting transmon qubits
论文作者
论文摘要
使用扫描和透射电子显微镜，电气传输，磁化，准颗粒光谱和实时实时实时磁磁光光学成像来表征用于制造超导尺寸的硅基底物上的硅薄膜。我们研究了尼伯膜膜，以提供一个综合分析集的示例，该分析集可能有益于超导电路，例如量子计算机中使用的电路。这些电影显示出$ t_ {C} = 9.35 $ K的出色超导过渡温度和相当干净的超导间隙，以及在中等温度下增强的超流体密度。这些观察结果与NB中各向异性强偶联超导性的最新理论一致。然而，对磁场的反应很复杂，表现出明显不可逆的行为和导致热磁性不稳定性的热电导不足。这些可能提出进一步改善跨月量子相干性的问题。讨论了可能的缓解策略。
Niobium thin films on silicon substrate used in the fabrication of superconducting qubits have been characterized using scanning and transmission electron microscopy, electrical transport, magnetization, quasiparticle spectroscopy, and real-space real-time magneto-optical imaging. We study niobium films to provide an example of a comprehensive analytical set that may benefit superconducting circuits such as those used in quantum computers. The films show outstanding superconducting transition temperature of $T_{c}=9.35$ K and a fairly clean superconducting gap, along with superfluid density enhanced at intermediate temperatures. These observations are consistent with the recent theory of anisotropic strong-coupling superconductivity in Nb. However, the response to the magnetic field is complicated, exhibiting significantly irreversible behavior and insufficient heat conductance leading to thermo-magnetic instabilities. These may present an issue for further improvement of transmon quantum coherence. Possible mitigation strategies are discussed.
