1.Department of Physics,Nanchang University,Nanchang,China;2.Department of Electronic Information Engineering,Nanchang University,Nanchang,China;3.Colloge of Physical Science and Technology,Yichun University,Yichun,China
Abstract:
A novel multiparty controlled bidirectional quantum secure direct communication protocol combining continuous-variable states with qubit block transmission is proposed. Two legitimate communication parties encode their own secret information into entangled optical modes with translation operations, and the secret information of each counterpart can only be recovered under the permission of all controllers. Due to continuous-variable states and block transmission strategy, the proposed protocol is easy to realize with perfect qubit efficiency. Security analyses show that the proposed protocol is free from common attacks, including the man-in-the-middle attack.
