Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Poster Session

TT 22.22: Poster

Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B

Experiments with two-cell flux qubits — •Alexey K. Feofanov and Alexey V. Ustinov — Physikalisches Institut III, Universität Erlangen-Nürnberg, Erlangen, Germany

A two-cell flux qubit with four Josephson junctions has an advantage over conventional single-cell three-junction flux qubits that it features orthogonal controls of both the potential barrier height and its symmetry.This aspect facilitates reliable initialization of the qubit and offers additional fast gate control. Changing the potential barrier height allows for moving the qubit operation point away from parasitic resonances and makes it possible to realize tuneable coupling to common bus. Our two-cell qubits feature asymmetric dc-SQUID readout and on-chip flux controls. To bias the qubit at the optimal working point we use a passive pi-shifter in the superconducting bar separating two cells. The readout is performed by standard pulse sequence consisting of short switching and long latching pulses. Experimental results on testing these devices will be reported.