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为了解决文献[1]中的一个重大缺陷,同时提高量子通信数据传输效率。我们设计了一种W态的高维量子安全直接通信方案。方案中,为了提高量子通信数据传输效率,我们引入了高维Bell态作为传输粒子,Alice(发送方)根据需要传输的信息,采用密集编码对传输信息序列进行编码,Bob(接收方)通过对接收粒子做联合测量,然后映射出相对应的经典信息。通信双方利用W粒子之间的纠缠特性,将W粒子作为检测粒子,通信双方通过对检测粒子的测量比较,从而实现信道的安全性。之后,采用熵理论和窃听检测分析协议的安全性,证明该方案是安全可靠的,最后计算得量子比特效率为43.8%,同时三粒子W态作为诱饵可以得到每量子位64%的窃听探测率,较扩展GHZ提高了6%的窃听率。
In order to solve one of the major shortcomings in [1], the efficiency of quantum communication data transmission is improved. We design a high-dimensional W-state quantum secure direct communication scheme. In order to improve the efficiency of quantum communication data transmission, we introduce a high-dimensional Bell state as a transmission particle. Alice (sender) encodes the transmission information sequence according to the information to be transmitted, and encodes the transmission information sequence by dense coding. Bob Receive particles do joint measurement, and then map out the corresponding classic information. Both parties of communication use the entanglement characteristic between W particles to make W particle as the detection particle, and both parties of the communication measure and compare the detection particle to realize the channel security. Then, the entropy theory and eavesdropping detection are used to analyze the security of the protocol, which proves that the scheme is safe and reliable. Finally, the calculated quantum bit efficiency is 43.8%. At the same time, the three-particle W state as the decoy can get the detection rate of 64% , GHZ increased more than 6% of the eavesdropping rate.