Affiliation:
1. School of Computer Science, Beijing University of Posts and Telecommunications, 10# Xitucheng Rd, Haidian District, Beijing 100876, P. R. China
Abstract
Detection efficiency of a quantum secure direct communication (QSDC) protocol is crucial. Therefore, it is necessary to improve the security of these protocols on the basis of new detection strategies. In this paper, a new strategy based on the five-particle cluster state is proposed, and applied to the two-step QSDC protocol. Moreover, information theoretical method and numerical analysis is applied to analyze the security of the improved protocol. If Eve intends to eavesdrop all of the information, the probability of being detected reaches up to 7/8, whereas the same is 0.5 in the original protocol. It is concluded that using the new detection strategy in the two-step QSDC protocol is more secure than using the original protocol when the quantum key distribution (QKD) protocol is considered.
Publisher
World Scientific Pub Co Pte Lt
Subject
Physics and Astronomy (miscellaneous)