Weak continuous monitoring of a flux qubit using coplanar waveguide resonator
G. Oelsner, S. H. W. van der Ploeg, P. Macha, Uwe Hübner, Detlef Born, Solveig Anders, Evgeni V. Il’ichev, H.‐G. Meyer, M. Grajcar, S. Wünsch, M. Siegel, A. N. Omelyanchouk, O. V. Astafiev · Physical Review B · 2010
We study a flux qubit in a coplanar waveguide resonator by measuring transmission through the system. In our system with the flux qubit decoupled galvanically from the resonator, the intermediate coupling regime is achieved. In this regime, dispersive readout is possible with weak back action on the qubit. The detailed theoretical analysis and simulations give good agreement with the experimental data and allow us to make the qubit characterization.