Abstract: In this paper, a genuine entangled 7-qubit state is presented as channel of quantum teleportation, and two schemes of bidirectional controlled quantum teleportation are developed. One scheme is that with the control of Charlie Alice transmits an unknown qubit to Bob and Bob transmits an unknown 2-qubit to Alice in the same time. Another scheme is that with the control of Charlie Alice transmits an unknown 2-qubit with the form of Schmidt decomposition to Bob and Bob transmits an arbitrary unknown 2-qubit to Alice simultaneously. In our schemes, the agents measure their particles with appropriate base and transmit the results to each other through classical channel. Then, the supervisor measure his particle with X base and transmit the result to the agents by classical communication. Finally, the agents can restore the quantum state teleported by the sender through applying unitary operators on his particles. Compared with the existed schemes, our scheme can transmit more qubits in total by an entangled state. That is to say, the intrinsic efficiency of our scheme is maybe the best. Moreover, the genuine entangled 7-qubit state used in our scheme can be produced through some simple quantum unitary gates.

Key words: quantum optics, bidirectional controlled quantum teleportation；asymmetric quantum teleportation； genuine seven-qubit entangled state