Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 42: Quantum Coherence, Quantum Information Systems 2

TT 42.9: Vortrag

Mittwoch, 13. März 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.