  We explore spintronics from a quantum information (QI) perspective. We show
that QI specific methods can be an effective tool in designing new devices.
Using the formalism of quantum gates acting on spin and mode degrees of
freedom, we provide a solution to a reverse engineering problem, namely how to
design a device performing a given transformation between input and output.
Among these, we describe an orientable Stern-Gerlach device and a new scheme to
entangle two spins by transferring the entanglement from orbital to spin
degrees of freedom. Finally, we propose a simple scheme to produce
hyper-entangle electrons, i.e., particles entangled in both spin and mode
degrees of freedom.
