Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 42: Quantum Coherence, Quantum Information Systems 2
TT 42.9: Talk
Wednesday, March 13, 2013, 17:30–17:45, H18
Decoherence due to quasiparticle tunneling in circuit QED — •Andreas Heimes1, Michael Marthaler1, Juha Leppäkangas2, and Gerd Schön1 — 1Institut für Theoretische Festkörperphysik, Karlsruher Institut für Technologie, Wolfgang-Gaede-Str. 1, D-76128 Karlsruhe, Germany — 2Microtechnology and Nanoscience, MC2, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
In recent years great effort in screening envoironmental decoherence sources lead to an increased coherence time of Josephson based qubits. Temperature dependent decay time measurements in phase and transmon qubits suggest that nonequilibrium quasiparticles have become one of the major limiting factors. We theoretically investigate this nonequilibrium situation and show that quasiparticle tunneling through Josephson junctions influences the excitation and relaxation dynamics of such quantum information devices.