Quantum Secure Communication Network on EPR States

A novel scheme for secure communication network with the two-step for three parties is proposed. The communication is based on Einstein-Podolsky-Rosen pairs (EPR pairs) and teleportation between P₁, P₂ and P₃. After insuring the security of the quantum channel through Hadamard (H) gate operations and Controlled-NOT (CNOT) gate operations on them, one sequence sent to P₃ from P₁. P₃ makes Bell-basis measurement to read their coding operations. We also prove that it is unconditionally secure. This scheme is feasible with present-day techniques. The feature of this scheme is that the communication between two parties depends on the agreement of the third party.