基于一类W态密集编码的量子安全直接通信方案

根据三粒子一类W态的特性及密集编码思想,提出了一种新的基于一类W态密集编码的量子安全直接通信方案。方案中除了安全检测的粒子,剩余的所有传输粒子全部对秘密信息进行密集编码,极大的提高了通信效率。同时为了保证方案的安全性,在粒子分发阶段利用W态粒子间的纠缠关联性,对信道进行了两次安全检测;在信息粒子传输阶段用粒子顺序重排和插入诱骗光子相结合的方法来提高对窃听者的检测率,减少信息的泄露量。最后的安全性分析表明,方案在提高通信效率的同时,保证了信息传输的安全性。

Quantum secure direct communication based on quantum dense coding using a class of W-states

According to the characteristics of a class of three-particle W-states and the quantum dense coding,a new quantum secure direct communication scheme is presented.All particles,which are transmitted,are used to encode secret information except for the particles for testing security,which can greatly improve the communication efficiency.In order to ensure the security of the scheme,the channel is tested two times using the entanglement correlation between particles of W-states in particle distribution phase.It can improve the detection rate for eavesdropper and the reduce information leakage by inserting decoy photons into particles and rearranging the order of particles in information transfer phase.Security analysis shows that the scheme can ensure information transfer security and improve communication efficiency.