  Using the Lindblad equation approach, we derive the range of the parameters
of an interacting one-dimensional electronic chain connected to two reservoirs
in the large bias limit in which an optimal working point (corresponding to a
change in the monotonicity of the stationary current as a function of the
applied bias) emerges in the nonequilibrium stationary state. In the specific
case of the one-dimensional spinless fermionic Hubbard chain, we prove that an
optimal working point emerges in the dependence of the stationary current on
the coupling between the chain and the reservoirs, both in the interacting and
in the noninteracting case. We show that the optimal working point is robust
against localized defects of the chain, as well as against a limited amount of
quenched disorder. Eventually, we discuss the importance of our results for
optimizing the performance of a quantum circuit by tuning its components as
close as possible to their optimal working point.
