Beamsplitting attack to the revised KKKP protocol and a possible solution

Wang, Xiang-Bin; Zhang, Qiang; Chen, Yu-Ao; Hwang, Wong-Young; Kim, Myungshik; Pan, Jian-Wei

Beamsplitting attack to the revised KKKP protocol and a possible solution

Authors

Description

We show that the revised KKKP protocol proposed by Kye and Kim [Phys. Rev. Lett. 95,040501(2005)] is still insecure with coherent states by a type of beamsplitting attack. We then further revise the KKKP protocol so that it is secure under such type of beamsplitting attack. The revised scheme can be used for not-so-weak coherent state quantum key distribution.
6pages, 1 figure