Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Transport - Poster Session
TT 28.22: Poster
Donnerstag, 29. März 2007, 14:00–17:45, Poster A
Design of a Flux Qubit with a nondestructive Readout System — •Christoph Kaiser, Andreas Graf, and Michael Siegel — Institut für Mikro- und Nanoelektronische Systeme, Universität Karlsruhe, D-76187 Karlsruhe
We are studying flux qubits based on Nb/Al/Al2O3/Nb tunnel junctions. The qubit consists of three Josephson tunnel junctions connected in series in a superconducting loop and is read out by an inductively coupled SQUID. In order to obtain a nondestructive readout, the SQUID is part of an LC circuit, whose resonant frequency depends on the inductance of the SQUID and hence on the qubit state [1].
We have carried out numerical simulations in order to obtain values for the minimum energy level splitting Δ and the persistent current Ip. Suitable design parameters were found and the influence of possible parameter deviations due to fabrication tolerances was studied. Furthermore, we investigated methods to reduce the stray inductance of the readout LC circuit and hence increase the readout resolution.
[1] A. Lupasçu et al., Phys. Rev. Lett. 93, 177006 (2004).