Controlled quantum network coding scheme based on single controller

This paper proposes a controlled quantum network coding scheme based on single controller so as to control the decoding operation at the receivers for traditional quantum network coding schemes. This scheme is designed based on the paradigm XQQ(Crossing Two Qubits) protocol, and it can control the decoding process of two receivers simultaneously by means of introducing the controller in controlled teleportation. Scheme analyses show that without the permission of the controller, any attacker cannot decode and acquire the quantum information from the senders in this scheme, even if he can get all the information of the receivers. Thus our scheme can enhance the security of transferring quantum information in quantum networks.