Two-step quantum direct communication protocol using the Einstein-Podolsky-Rosen pair block

A protocol for quantum secure direct communication using blocks of Einstein-Podolsky-Rosen (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 messag...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2003-10, Vol.68 (4), Article 042317
Main Authors: Deng, Fu-Guo, Long, Gui Lu, Liu, Xiao-Shu
Format: Article
Language:English
Subjects:
ATOMIC AND MOLECULAR PHYSICS
CORRELATIONS
DATA TRANSMISSION
ENERGY LEVELS
PHOTONS
QUANTUM MECHANICS
QUANTUM OPERATORS
RANDOMNESS
READOUT SYSTEMS
SECRECY PROTECTION
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Summary:A protocol for quantum secure direct communication using blocks of Einstein-Podolsky-Rosen (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 sends 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.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.68.042317