Tunable and Switchable Coupling Between Two Superconducting Resonators
  We realize a device allowing for tunable and switchable coupling between two superconducting resonators mediated by an artificial atom. For the latter, we utilize a persistent current flux qubit. We characterize the tunable and switchable coupling in frequency and time domain and find that the coupling between the relevant modes can be varied in a controlled way. Specifically, the coupling can be tuned by adjusting the flux through the qubit loop or by saturating the qubit. Our time domain measurements allow us to find parameter regimes for optimal switch performance with respect to qubit drive power and the dynamic range of the resonator input power. 
A. Baust, E. Hoffmann, M. Haeberlein, M. J. Schwarz, P. Eder, E. P.   Menzel, K. Fedorov, J. Goetz, F. Wulschner, E. Xie, L....
cond-mat.mes-hall cond-mat.supr-con quant-ph