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arXiv · 1507.05126

Frequency-tunable Superconducting Resonators via Nonlinear Kinetic Inductance

Michael R. Vissers·Johannes Hubmayr·Martin Sandberg·Saptarshi Chaudhuri·Clint Bockstiegel·Jiansong Gao
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Abstract

We have designed, fabricated and tested a frequency-tunable high-Q superconducting resonator made from a niobium titanium nitride film. The frequency tunability is achieved by injecting a DC current through a current-directing circuit into the nonlinear inductor whose kinetic inductance is current-dependent. We have demonstrated continuous tuning of the resonance frequency in a 180 MHz frequency range around 4.5 GHz while maintaining the high internal quality factor $Q_i> 180,000$. This device may serve as a tunable filter and find applications in superconducting quantum computing and measurement. It also provides a useful tool to study the nonlinear response of a superconductor. In addition, it may be developed into techniques for measurement of the complex impedance of a superconductor at its transition temperature and for readout of transition-edge sensors.

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Michael R. Vissers, Johannes Hubmayr, Martin Sandberg, Saptarshi Chaudhuri, Clint Bockstiegel, Jiansong Gao. 2015-07-17. Frequency-tunable Superconducting Resonators via Nonlinear Kinetic Inductance. https://doi.org/10.1063/1.4927444

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