Secure direct communication using Einstein-Podolsky-Rosen pairs and teleportation

Details Secure direct communication using Einstein-Podolsky-Rosen pairs and teleportation Secure direct communication using Einstein-Podolsky-Rosen pairs and teleportation

2003-11-19

arxiv.org/abs/quant-ph/0311132v1

The European Physical Journal B, 41 (2004) 75

Physics

Quantum Physics

Scientific paper

10.1140/epjb/e2004-00296-4

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 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 carry 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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