  The scalability of solid state quantum computation relies on the ability of
connecting the qubits to the macroscopic world. Quantum chains can be used as
quantum wires to keep regions of external control at a distance. However even
in the absence of external noise their transfer fidelity is too low to assure
reliable connections. We propose a method of optimizing the fidelity by minimal
usage of the available resources, consisting of applying a suitable sequence of
two-qubit gates at the end of the chain. Our scheme allows also the preparation
of states in the first excitation sector as well as cooling.
