  We analyse quantum teleportation (QT) and entanglement swapping (ES) for spin
systems. If the permitted operations are restricted to the Ising interaction,
plus local rotations and spin measurements, high-fidelity teleportation is
achievable for quantum states that are close to the maximally weighted spin
state. ES is achieved, and is maximized for a combination of entangled states
and Bell measurements that is different from the QT case. If more general local
unitary transformations are considered, then it is possible to achieve perfect
teleportation and ES.
