Radio-frequency method for investigation of quantum properties of superconducting structures
Evgeni V. Il’ichev, Nikolai Oukhanski, Th. Wagner, H.‐G. Meyer, Anatoly Yu. Smirnov, M. Grajcar, A. Izmalkov, Detlef Born, Wolfram Krech, Alexandre M. Zagoskin · Low Temperature Physics · 2004
We implement the impedance measurement technique (IMT) for characterization of interferometer-type superconducting qubits. In the framework of this method, the interferometer loop is inductively coupled to a high-quality tank circuit. We show that the IMT is a powerful tool for studying the response of an externally controlled two-level system to different types of excitations. Conclusive information about the qubits is obtained from a readout of the tank properties.