Non-information leakage controlled quantum conversation protocol based on using entanglement exchange measurement correlation and reducing transmission efficiency

At present, information leakage is still a serious security hole of a quantum conversation protocol. The invention provides a non-information leakage controlled quantum conversation protocol based on using entanglement exchange measurement correlation and reducing transmission efficiency to enable both communication sides of Bob and Charlie to be capable of achieving quantum conversation without information leakage under the control of a controller Alice. The protocol fully utilizes measurement correlation of two GHZ states after entanglement exchange and transmission efficiency reduction to prevent information leakage from occurring. In addition, the protocol does not need GHZ base measurement but just needs Bell base measurement. Safety analysis indicates that the protocol can resist active attack, such as interception and capture-attack resending and measurement-attack resending and entanglement-attack measurement, of external eavesdroppers.