Physics – Quantum Physics
Scientific paper
2004-03-30
Physics
Quantum Physics
Scientific paper
In light of Deng-Long-Liu's two-step secret direct communication protocol using the Einstein-Podolsky-Rosen pair block [Phys. Rev. A {\bf 68}, 042317 (2003)], by introducing additional local operations for encoding, we propose a brand-new secure direct communication protocol, in which two legitimate users can simultaneously transmit their different secret messages to each other in a set of quantum communication device.
Man Zhong-Xiao
Zhang Zi-Jian
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