摘要
最近夏和歌[Phys。Lett。一 364 (2007 ) 117 ] 建议了控制的量安全直接通讯(CQSDC ) 协议。他们宣称在他们仅仅在控制器查理的帮助下的协议，接收装置爱丽斯能成功地从发送者鲍勃提取秘密消息。在这封信，如果它不为他们的无理的设计，首先，我们将证明在他们的协议以内，控制器查理的角色能被排除了。我们然后修订夏·松·克斯德克协议以便它的原来的优点被保留， CQSDC 能确实被认识到。
Recently Xia and Song [Phys. Lett. A 364 （2007） 117] have proposed a controlled quantum secure direct communication （CQSDC） protocol. They claimed that in their protocol only with the help of the controller Charlie, the receiver Alice can successfully extract the secret message from the sender Bob. In this letter, first we will show that within their protocol the controller Charlie＇s role could have been excluded if it were not for their unreasonable design. We then revise the Xia-Song CQSDC protocol such that its original advantages are reta/ned and the CQSDC can be really realized.
基金
The project supported by the Program of New Century Excellent Talents at the University of China under Grant No.NCET-06-0554
National Natural Science Foundation of China under Grant Nos.60677001 and 10747146
the Science-Technology Fund of Anhui Province for Outstanding Youth under Grant No.06042087
the Key Fund of the Ministry of Education of China under Grant No.206063
the Natural Science Foundation of Guangdong Province under Grant Nos.06300345 and 7007806
the Natural Science Foundation of Hubei Province under Grant No.2006ABA354
关键词
量子安全直接通讯
量子超密点
非平衡性量子渠道
量子学
quantum secure direct communication, quantum superdense coding, non-symmetric quantumchannel
