Secure Quantum Dialogue Protocol Based On Four-Qubit Cluster State

In this paper, a quantum dialogue protocol is proposed based on four-qubit Cluster state, which constructed a new quantum channel. By using Bell measurements and the corresponding unitary operation, two users can exchange their messages simultaneously and directly. And two security cheques are adopted to ensure its transmission security against the several well-known attacks from an outside eavesdropper. The protocol can avoid the information leakage, and it is simple and feasible with current technique.