2015/07/17 by Michael R. Vissers, Johannes Hubmayr, Martin Sandberg +3 · 2 citations
Physics and Astronomy · #cond-mat.supr-con
paper · pdf · doi:10.1063/1.4927444
10 pages, 4 figures
arxiv created 2015/07/17 · arxiv updated 2015/09/02
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 Qi> 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.