  We introduce a model of quantum teleportation on a channel built on a quantum
dot chain. Quantum dots are coupled through hopping and each dot can accept
zero, one or two electrons. Vacuum and double occupation states have the same
potential energy, while single occupation states are characterized by a lower
potential energy. A single dot initially decoupled from the others is weakly
coupled with an external element (Bob), where a pair of electrons has been
previously localized. Because of hopping after a suitable time the two dots
charge states become maximally entangled. Another chain dot (Alice) is put in
an unknown superposition of vacuum and double occupation states, and the other
dots are initially empty. The time evolution of the system involves an electron
diffusive process. A post selection procedure represented by the detection of
charge pairs in a region of the chain equidistant from Alice and Bob, allows,
if successful, the reconstruction on the Bob site of the unknown state
initially encoded by Alice. The peculiar feature of the model is that the
introduction of a trapped magnetic field strongly improves the process
efficiency.
