%0 Journal Article
%T Single Cooper-pair pumping in the adiabatic limit and beyond
%A S. Gasparinetti
%A P. Solinas
%A Y. Yoon
%A J. P. Pekola
%J Physics
%D 2012
%I arXiv
%R 10.1103/PhysRevB.86.060502
%X We demonstrate controlled pumping of Cooper pairs down to the level of a single pair per cycle, using an rf-driven Cooper-pair sluice. We also investigate the breakdown of the adiabatic dynamics in two different ways. By transferring many Cooper pairs at a time, we observe a crossover between pure Cooper-pair and mixed Cooper-pair-quasiparticle transport. By tuning the Josephson coupling that governs Cooper-pair tunneling, we characterize Landau-Zener transitions in our device. Our data are quantitatively accounted for by a simple model including decoherence effects.
%U http://arxiv.org/abs/1206.0193v1