Teleportation of two-particle entangled state via cluster state
  We present two schemes for teleporting an unknown two-particle entangled state from a sender (Alice) to a receiver (Bob) via a four-particle entangled cluster state. As it is shown, the unknown two-particle entangled state can be teleported perfectly, and the successful possibilities and fidelities of the two schemes both reach unit. 
Da-Chuang Li, Zhuo-Liang Cao