Low Temperature Physics: 30, 620 (2004); https://doi.org/10.1063/1.1789933 (9 pages)
Физика Низких Температур: Том 30, Выпуск 7-8 (Июль 2004), c. 823-833    ( к оглавлению , назад )

Radio-frequency method for investigation of quantum properties of superconducting structures

E. Il’ichev1, A.Yu. Smirnov2, M. Grajcar3, A. Izmalkov1,4, D. Born1,5

1Institute for Physical High Technology, P.O. Box 100239, D-07702 Jena, Germany
2D-Wave Systems Inc., 320-1985 W. Broadway, Vancouver, B.C. , V6J 4Y3, Canada
E-mail: ilichev@ipht-jena.de

N. Oukhanski1, Th. Wagner1, W. Krech5, H.-G. Meyer1, and A. Zagoskin2,6

3Department of Solid State Physics, Comenius University, SK-84248 Bratislava, Slovakia
4Moscow Engineering Physics Institute (State University), Kashirskoe sh. 31 , Moscow, 115409, Russia

5Friedrich Schiller University, Institute of Solid State Physics, D-07743 Jena, Germany
6Physics and Astronomy Dept., The University of British Columbia 6224 Agricultural Rd., Vancouver, B.C., V6T 1Z1 Canada

Received January 28, 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 to study a response of externally controlled two-level system to different types of excitations. Conclusive information about qubits is obtained from the read-out of the tank properties.

74.50.+r - Tunneling phenomena; point contacts, weak links, Josephson effects (for SQUIDs, see 85.25.Dq; for Josephson devices, see 85.25.Cp; for Josephson junction arrays, see 74.81.Fa)
85.25.-j - Superconducting devices