Physics – Quantum Physics
Scientific paper
2003-08-29
Phys. Rev. A68, 042317 (2003)
Physics
Quantum Physics
8 pages and 2 figures. To appear in Phys Rev A
Scientific paper
10.1103/PhysRevA.68.042317
A protocol for quantum secure direct communication using blocks of EPR pairs is proposed. A set of ordered $N$ EPR pairs is used as a data block for sending secret message directly. The ordered $N$ EPR set is divided into two particle sequences, a checking sequence and a message-coding sequence. After transmitting the checking sequence, the two parties of communication check eavesdropping by measuring a fraction of particles randomly chosen, with random choice of two sets of measuring bases. After insuring the security of the quantum channel, the sender, Alice encodes the secret message directly on the message-coding sequence and send them to Bob. By combining the checking and message-coding sequences together, Bob is able to read out the encoded messages directly. The scheme is secure because an eavesdropper cannot get both sequences simultaneously. We also discuss issues in a noisy channel.
Deng Fu-Guo
Liu Xiao-Shu
Long Gui Lu
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