Tunable Resonators for Quantum Circuits
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We have designed, fabricated and measured high-Q λ/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 3×104. We present a model based on thermal fluctuations that accounts for the dependence of the quality factor with magnetic field.
KeywordsStripline resonators Superconducting quantum devices SQUIDs
PACS74.78.-w 84.40.Dc 85.25.Am 85.25.Dq
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