LAUSR

Shared quantum entanglements are rare resources and widely used in various quantum information processing. They are thought sometimes to be more important than local operation and classical communication. In this paper a shared mixing entangled state derived from a pair of Bell states due to participants’ qubit confusion is taken as quantum channel and a quantum teleportation scheme is amply put forward. It is shown that, the state can be used to teleport a single-qubit state with success probability 3/4 rather than discarded. More importantly, from it a Bell state can be derived with 1/2 probability so that whether the teleportation is further proceeded or not can be decided in advance. If not, the unknown state to be teleported will not be destroyed due to the measure. The additional costs in contrast to standard single-qubit state teleportation are two control-not gate operations, two single-qubit measures and a classical-bit message consumption. The underlying reason of abstracting a shared entanglement for quantum teleportation is revealed.