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Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 29: Poster Session: Quantum Information Systems, Quantum Coherence (jointly with SAMOP)

TT 29.4: Poster

Dienstag, 15. März 2011, 18:00–21:00, P1

Two Level Fluctuators in Josephson qubits — •Daniel Mischek1, Clemens Müller1,2, and Alexander Shnirman1,21Institut für Theorie der Kondensierten Materie, Karlsruhe, Germany — 2DFG-Center for Functional Nanostructures (CFN), Karlsruhe, Germany

Spectroscopic analysis of superconducting qubits often shows clear signatures of avoided level crossings, indicating the presence of microscopic two-level fluctutors (TLFs) coupling to the qubit[1].

Within ”direct coherent control” method it was possible for the first time to investigate coherence times and temperatures properities of single TLFs[2].

Measurements of relaxation time shows unusual behaviour of temperature dependence. Within Bloch Redfield formalism we analyse the influence of higher qubit levels on the resonance shape of relaxation time.
R.W.Simmonds et al., Phys. Rev. Lett. 93, 077003 (2004)
J.Lisenfeld et al., arXiv: 1008.0337

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