Which Kind of Two-Particle States Can Be Teleported through a   Three-Particle Quantum Channel?
  The use of a three-particle quantum channel to teleport entangled states through a slight modification of the standard teleportation procedure is studied. It is shown that it is not possible to perform successful teleportation of an arbitrary and unknown two-particle entangled state, following our version of the standard teleportation procedure. On the contrary, it is shown which, and in how many different ways, particular classes of two-particle states can be teleported. 
Luca Marinatto, Tullio Weber