Bidirectional quantum controlled teleportation of unique four-qubit states by newly entangled 15-qubit state

Using fifteen qubits entangled state, we proposed a theoretically novel protocol for Bidirectional Quantum Controlled Teleportation for a unique four-qubit state. The specialty of the proposed protocol is that in order to minimize resource consumption, users can apply only a few GHZ-state measurements in the entire protocol. The entangled state of 15-qubit acts as the quantum channel in which two users simultaneously teleport a four-qubit state under the controller as a third party. Following that, the protocol efficiency and security are computed and evaluated, concluding that protocol security is ensured.