Abstract
A controlled quantum secure direct communication and authentication protocol is proposed with a quantum one-time pad based on five-particle cluster state. Photon 4 in each five-particle cluster state is sent to the controller as permission. Unitary operation I (U) on photon 4 according to identity-string of the receiver is used to forbid the controller to deduce secret message. The classical XOR operation serving as a one-time-pad is used to forbid external eavesdroppers to eavesdrop. Eavesdropping detection and identity authentication are implemented by previously shared reusable base identity-strings. In one transmission, one qubit of each five-particle cluster state is used as controller’s permission, and two qubits are used to transmit two classical bit information.
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