Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 101: Transport - Poster Session

TT 101.27: Poster

Donnerstag, 3. April 2014, 15:00–19:00, P2

Quasiparticle induced qubit dephasing — •Sebastian Zanker, Michael Marthaler, and Gerd Schön — Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, Karlsruhe, Germany

We investigate dephasing in superconducting qubits due to quasiparticle tunneling. Contrary to qubit relaxation dephasing cannot be treated with golden rule calculations. Nonetheless one can define a dephasing rate which has to be obtained self-consistently. However, we show that qubit dephasing doesn't obey a simple exponential decay but has a more complex time dependence.