Selected Publications

Single Cooper-pair pumping in the adiabatic limit and beyond

S. Gasparinetti, P. Solinas, Y. Yoon, J.P. Pekola

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.

Phys. Rev. B 86, 060502 (2012)

doi: 10.1103/PhysRevB.86.060502