Jian Li, DanJie Song, Ruifan Li and Xiaofeng Lu A quantum secure direct communication protocol based on four-qubit cluster state Security and Communication Networks 8
We present a deterministic secure quantum communication protocol based on four-particle cluster state. In the security analysis, the method of the entropy theory is introduced. The eavesdropping detection rate of the original protocol is 50%, whereas ours is 75%.
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