LIU Yu1, HUA Sha¹, WANG Xiao-Xin², LI Yue³, YE Jun¹, LI Jun4
¹Department of Electronics and Information, Huazhong University of Science and Technology, Wuhan 430074
²Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
³College of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan 430074
⁴Institute of Optoelectronics Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074
A Flexible Improvement for Ping-Pong Protocol
LIU Yu1;HUA Sha¹;WANG Xiao-Xin²;LI Yue³;YE Jun¹;LI Jun4
¹Department of Electronics and Information, Huazhong University of Science and Technology, Wuhan 430074
²Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
³College of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan 430074
⁴Institute of Optoelectronics Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074
Abstract： A deterministic quantum communication protocol, called the ping-pong protocol, has been represented by Boström 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.
LIU Yu;HUA Sha⊃WANG Xiao-Xin⊃LI Yue⊃YE Jun⊃LI Jun. A Flexible Improvement for Ping-Pong Protocol[J]. 中国物理快报, 2006, 23(12): 3152-3154.
LIU Yu, HUA Sha&sup, WANG Xiao-Xin&sup, LI Yue&sup, YE Jun&sup, LI Jun. A Flexible Improvement for Ping-Pong Protocol. Chin. Phys. Lett., 2006, 23(12): 3152-3154.
2006, Vol. 23 
