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Tunable coupling of transmission-line microwave resonators mediated by an rf SQUID

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arxiv 1508.06758 v2 pith:5SVUWJNQ submitted 2015-08-27 cond-mat.supr-con quant-ph

Tunable coupling of transmission-line microwave resonators mediated by an rf SQUID

F. Wulschner , J. Goetz , F. R. Koessel , E. Hoffmann , A. Baust , P. Eder , M. Fischer , M. Haeberlein
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M. J. Schwarz M. Pernpeintner E. Xie L. Zhong C. W. Zollitsch B. Peropadre J.-J. Garcia Ripoll E. Solano K. Fedorov E. P. Menzel F. Deppe A. Marx R. Gross
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classification cond-mat.supr-con quant-ph
keywords couplingresonatorscasemediatedmicrowavesquidstrengthtransmission
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We realize tunable coupling between two superconducting transmission line resonators. The coupling is mediated by a non-hysteretic rf SQUID acting as a flux-tunable mutual inductance between the resonators. From the mode distance observed in spectroscopy experiments, we derive a coupling strength ranging between -320MHz and 37 MHz. In the case where the coupling strength is about zero, the microwave power cross transmission between the two resonators can be reduced by almost four orders of magnitude compared to the case where the coupling is switched on. In addition, we observe parametric amplification by applying a suitable additional drive tone.

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