  We present a model of quantum teleportation protocol based on one-dimensional
quantum dots system. Three quantum dots with three electrons are used to
perform teleportation, the unknown qubit is encoded using one electron spin on
quantum dot A, the other two dots B and C are coupled to form a mixed
space-spin entangled state. By choosing the Hamiltonian for the mixed
space-spin entangled system, we can filter the space (spin) entanglement to
obtain pure spin (space) entanglement and after a Bell measurement, the unknown
qubit is transfered to quantum dot B. Selecting an appropriate Hamiltonian for
the quantum gate allows the spin-based information to be transformed into a
charge-based information. The possibility of generalizing this model to
N-electrons is discussed.
