MULTIPARTY-CONTROLLED QUANTUM SECURE DIRECT COMMUNICATION
Xiao-Ming Xiu, Ya-Jun Gao, Feng Chi

Received: June 15, 2007

PACS: 03.67.Hk, 03.67.Dd, 03.65.Ud

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A theoretical scheme of a multiparty-controlled quantum secure direct communication is proposed. The supervisor prepares a communication network with Einstein-Podolsky-Rosen pairs and auxiliary particles. After the security test of the communication network is passed, the supervisor tells the users the network is secure and they can communicate. If the controllers allow the communicators to communicate, they should perform measurements and tell the measurement outcomes to them. The communicators then begin to communicate after they perform the security test of the quantum channel and verify that it is secure. The recipient can decrypt the secret message in a classical message from the sender depending on their protocol. Any two users in the network can communicate through the above processes under the controls of the supervisor and the controllers.