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In this paper, a three party controlled quantum secure direct communicationprotocol based on GHZ like state is proposed. In this scheme, the receiver canobtain the sender s two secret bits under the permission of the controller. Byusing entanglement swapping, no qubits carrying secret messages aretransmitted. Therefore, if the perfect quantum channel is used, the protocol iscompletely secure. The motivation behind utilizing GHZ like state as a quantumchannel is that if a qubit is lost in the GHZ like state the other two qubitsare still entangled. The proposed protocol improves the efficiency of theprevious ones.

Efficient controlled quantum secure direct communication based on GHZ-like states