Tunable resonators for quantum circuits

A. Palacios-Laloy (1) , F. Nguyen (1) , F. Mallet (1) , Patrice Bertet (1) , Denis Vion (1) , Daniel Esteve (1)

1 QUANTRONICS - Quantronics Group

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$\times10^4$. We present a model based on thermal fluctuations that accounts for the dependance of the quality factor with magnetic field.

Domaines: Physique Quantique [quant-ph]; Supraconductivité [cond-mat.supr-con]; Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

A. Palacios-Laloy, F. Nguyen, F. Mallet, Patrice Bertet, Denis Vion, et al.. Tunable resonators for quantum circuits. 2007. ⟨hal-00193151⟩