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In order to avoid the risk of information leakage during the informationmutual transmission between two authorized participants, i.e., Alice and Bob, aquantum dialogue protocol based on the entanglement swapping between any twoBell states and the shared secret Bell state is proposed. The proposed protocolintegrates the ideas of block transmission, two-step transmission and unitaryoperation encoding together using the Bell states as the information carriers.Besides the entanglement swapping between any two Bell states, a shared secretBell state is also used to overcome the information leakage problem, which notonly makes Bob aware of the prepared initial state but also is used for Bob'sencoding and entanglement swapping. Security analysis shows that the proposedprotocol can resist the general active attacks from an outside eavesdropperEve. Moreover, the relation between the maximal amount of information Eve cangain and the detection probability is derived.

Quantum dialogue without information leakage based on the entanglement swapping between any two Bell states and the shared secret Bell state