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TT: Fachverband Tiefe Temperaturen

TT 46: SC: Tunneling, Josephson Junctions, SQUIDs 1

TT 46.1: Talk

Thursday, March 17, 2011, 10:30–10:45, HSZ 301

Quasiparticle tunneling in superconducting qubits — •Juha Leppäkangas, Michael Marthaler, and Gerd Schön — Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, D-76128, Germany

In this work we consider the effect of quasiparticle tunneling on Josephson qubits in the high E_J/E_C-limit. Such qubits are immune to pure dephasing due to background charge fluctuations or quasiparticle tunneling across the Josephson junctions. However, the induced energy-decay can still be relatively fast in the presence of typical nonequilibrium quasiparticle density. We consider energy-decay rates due to quasiparticle tunneling for both the equilibrium and nonequilibrium quasiparticles in few qubit designs.