Novel Controlled Quantum Dialogue Protocols Without Information Leakage

Controlled dialogue protocol refers to the communication between two parties need to be controlled by a third party and can be widely used in many scenarios in real society. In this paper, by utilizing unitary operations, single-particle measurement and GHZ states entanglement swapping, we propose two novel controlled quantum dialogue protocols based on GHZ states respectively. Without revealing any information, our proposed protocols can effectively resist various attacks.