Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 29: Quantenkoh
ärenz und Quanteninformationssysteme II

TT 29.1: Vortrag

Donnerstag, 11. März 2004, 14:30–14:45, H19

Experimental investigations of superconducting qubits using a resonant tank circuit. — •Il’ichev Evgeni — IPHT, A. Einstein Str. 9, 07745 Jena, Germany

On-chip LC tank circuits with a high quality factor  2000 can be effective probes of superconducting qubits, to which they are coupled inductively. Resonant properties of the circuits are strongly dependent on the qubit’s effective susceptibility that allows to measure the qubit’s tunneling amplitude and decoherence rate. This setup trades off time control for sensitivity at the LC-resonance frequency. As a result, a weak coupling to the qubit suffices, which helps to reduce measurement-induced decoherence in the system. Weak continuous measurements of Rabi oscillations and a detection of Landau-Zener transitions will be discussed together with low-frequency measurements of the energy splitting in the flux qubit.