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.
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Received: 17 March 2004, Published online: 30 September 2004
PACS:
03.67.Dd Quantum cryptography - 03.67.Hk Quantum communication
F.L. Yan: Present address: Department of Physics, Hebei Normal University, Shijiazhuang 050016, P.R. China
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Yan, F.L., Zhang, X.Q. A scheme for secure direct communication using EPR pairs and teleportation. Eur. Phys. J. B 41, 75–78 (2004). https://doi.org/10.1140/epjb/e2004-00296-4
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DOI: https://doi.org/10.1140/epjb/e2004-00296-4