Superconducting single-charge transistor in a tunable dissipative environment - art. no. 136802

We study a superconducting single-charge transistor, where the coherence of Cooper pair tunneling is destroyed by the coupling to a tunable dissipativ e environment. Sequential tunneling and cotunneling processes are analyzed to construct the shape of the conductance peaks and their dependence on the dissipation and temperature. Unexpected features are found due to a crosso ver between two distinct regimes, one "environment assisted" the other "env ironment dominated." Several of the predictions have been confirmed by rece nt experiments. The model and results apply also to the dynamics of Josephs on junction quantum bits on a conducting ground plane, thus explaining the influence of dissipation on the coherence.