Microresonators Fabricated from High-Kinetic-Inductance Aluminum Films
Microresonators Fabricated from High-Kinetic-Inductance Aluminum Films
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DOI：
10.1103/physrevapplied.11.011003
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发表时间：
2018-06
影响因子：
4.6
通讯作者：
Wenyuan Zhang;K. Kalashnikov;Wen-Sen Lu;P. Kamenov;T. Dinapoli;M. Gershenson
中科院分区：
文献类型：
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作者：
Wenyuan Zhang;K. Kalashnikov;Wen-Sen Lu;P. Kamenov;T. Dinapoli;M. Gershenson
我们研究了由无序（颗粒）铝膜制备的超导共面波导（CPW）谐振器。非常高的动力学电感这些薄膜，固有的无序材料，使我们能够实现超短（200 $\mu$m在5GHz的谐振频率）和高阻抗（高达5 k$\Omega$）半波长谐振器。我们已经表明，在这些谐振器中的固有损耗在温度$\lesssim 250$ mK是有限的谐振器耦合到环境中的两个级别的系统。所展示的内部品质因数与由常规超导体制成的共面波导谐振器的品质因数相当。高的动力学电感和众所周知的损耗使得这些无序铝谐振器有希望用于广泛的微波应用，包括动力学电感光子探测器和超导量子电路。
We have studied superconducting coplanar-waveguide (CPW) resonators fabricated from disordered (granular) films of Aluminum. Very high kinetic inductance of these films, inherent to disordered materials, allows us to implement ultra-short (200 $\mu$m at a 5GHz resonance frequency) and high-impedance (up to 5 k$\Omega$) half-wavelength resonators. We have shown that the intrinsic losses in these resonators at temperatures $\lesssim 250$ mK are limited by resonator coupling to two-level systems in the environment. The demonstrated internal quality factors are comparable with those for CPW resonators made of conventional superconductors. High kinetic inductance and well-understood losses make these disordered Aluminum resonators promising for a wide range of microwave applications which include kinetic inductance photon detectors and superconducting quantum circuits.