%0 Journal Article
%T A Flexible Improvement for Ping-Pong Protocol
%A LIU Yu
%A HUA Sha&sup
%A WANG Xiao-Xin&sup
%A LI Yue&sup
%A YE Jun&sup
%A LI Jun
%A <br>刘玉
%A 华沙
%A 王晓鑫
%A 李玥
%A 叶俊
%A 李俊
%J 中国物理快报
%D 2006
%I 
%X A deterministic quantum communication protocol, called the ping-pong protocol, has been represented by Bostr m and Felbinger Phys. Rev. Lett. 89 (2002) 187902]. Based on an entangled pair of photons, it allows asymptotically secure key distribution and quasi-secure direct communication. However, it was concluded from our previous research that the experiment realization of this protocol requires two optic paths strictly equivalent for interferometry. Here we propose an improved protocol, which is more flexible and secure for conceivable applications. Its feasibility and security are also discussed.
%K 03
%K 67
%K Hk
%K 03
%K 65
%K Ud<br>乒乓协议
%K 确定性量子通信协议
%K 柔性改进
%K 光子纠缠对
%K 准安全直接通信
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=E27DA92E19FE279A273627875A70D74D&aid=111354E03AF03AACB82315952EFB71A8&yid=37904DC365DD7266&vid=EA389574707BDED3&iid=59906B3B2830C2C5&sid=8494CCA9DB6270DC&eid=E76E83BE92E4D2E5&journal_id=0256-307X&journal_name=中国物理快报&referenced_num=0&reference_num=23