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TT: Fachverband Tiefe Temperaturen

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

TT 29.9: Poster

Tuesday, March 15, 2011, 18:00–21:00, P1

The influence of noise on the measurement of the Berry phase in superconducting circuits — •Vera Gramich and Joachim Ankerhold — Institut für Theoretische Physik, Universität Ulm, D-89069 Ulm

Motivated by recent experiments of Cooper pair pumping in a novel type of a phase-biased charge pump (‘Cooper pair sluice’), we study the influence of noise on the measurement of the Berry phase for such a configuration embedded in a superconducting loop. In the adiabatic regime a master equation beyond the RWA (Rotating Wave Approximation) for an open two level quantum system is derived taking consistently into account the combined effect of drive and dissipation. This also includes the driving and friction induced Lamb-shifts. Their impact on the steady state density matrix, which determines the pumped charge, is analyzed for an experimental set-up. Strategies to measure the Lamb-shift in a condensed matter environment are discussed.