Abstract: A scheme of two-way teleportation was proposed, with GHZ quadripartite entangled state as Quantum Channel. Two sides of communication(Alice and Bob), shared two pairs of GHZ quadripartite entangled state in advance. After communication, Alice and Bob performed quantum projection measurement on their own qubits respectively, and announced the measured results via Classical Channel. Then according to the measured results presented by the other party, Alice and Bob could make appropriate unitary transformations that its own party can reconstruct the opposite quantum state information, and thus the whole two-way teleportation was realized. As long as the both sides of communication chose the suitable GHZ entangled state as quantum channel and distributed the entangled partites imparity and properly in advance, we were able to realize two-way teleporting unknown general one qubit and two qubits entangled Bell state or three qubits entangled GHZ state respectively.

Key words: Quantum optics, Two-way quantum teleportation, GHZ quadripartite entangled state, Quantum projection measurement, Unitary transformation