Eavesdropping on the "ping-pong" quantum communication protocol -: art. no. 157901
Eavesdropping on the "ping-pong" quantum communication protocol -: art. no. 157901
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DOI：
10.1103/physrevlett.90.157901
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发表时间：
2003-04-18
影响因子：
8.6
通讯作者：
Wójcik, A
中科院分区：
文献类型：
--
作者：
Wójcik, A
Bostrom和Felbinger最近提出的“乒乓”量子通信协议的安全性[Phys.Rev.Lett. 89，187902（2002）]在相当大的量子信道损耗的情况下进行了分析。提出了一种窃听方案，揭示了乒乓协议在传输效率低于60%时是不安全的。我们的计划会导致50%的损失，但是，可以隐藏在信道损失，如果一个取代原来的有损信道与一个较少的损耗。最后，对乒乓协议的安全性提出了可能的改进。
Security of the "ping-pong" quantum communication protocol recently proposed by Bostrom and Felbinger [Phys. Rev. Lett. 89, 187902 (2002)] is analyzed in the case of considerable quantum channel losses. The eavesdropping scheme is presented, which reveals that the ping-pong protocol is not secure for transmission efficiencies lower than 60%. Our scheme induces 50% losses, which, however, can be hidden in the channel losses if one replaces the original lossy channel with a less lossy one. Finally, a possible improvement of the ping-pong protocol security is proposed.