Article

The European Physical Journal B - Condensed Matter and Complex Systems

, Volume 41, Issue 1, pp 75-78

A scheme for secure direct communication using EPR pairs and teleportation

  • F. L. YanAffiliated withCCAST (World Laboratory)Department of Physics, Hebei Normal University Email author 
  • , X. Q. ZhangAffiliated withDepartment of Physics, Hebei Normal University

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Abstract.

A novel scheme for secure direct communication between Alice and Bob is proposed, where there is no need for establishing a shared secret key. The communication is based on Einstein-Podolsky-Rosen (EPR) pairs and teleportation between Alice and Bob. After insuring the security of the quantum channel (EPR pairs), Bob encodes the secret message directly on a sequence of particle states and transmits them to Alice by teleportation. In this scheme teleportation transmits Bob’s message without revealing any information to a potential eavesdropper. Alice can read out the encoded messages directly by the measurement on her qubits. Because there is not a transmission of the qubit which carries the secret message between Alice and Bob, it is completely secure for direct secret communication if perfect quantum channel is used.