Tunable resonators for quantum circuits

Abstract

We have designed, fabricated and measured high-Q $\lambda /2$ coplanar waveguide microwave resonators whose resonance frequency is made tunable with magnetic field by inserting a DC-SQUID array (including 1 or 7 SQUIDs) inside. Their tunability range is 30% of the zero field frequency. Their quality factor reaches up to 3$\times 10^4$. We present a model based on thermal fluctuations that accounts for the dependance of the quality factor with magnetic field.

subm. to JLTP (Proc. of LTD12 conference)

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