Improvement on Quantum Secure Direct Communication with W State in Noisy Channel

• 出 处: Communications in Theoretical Physics
• 发表日期: 2009年02期
• 关键词: secure entanglement teleportation bases Probability establishing users estab mes

An improvement (Y-protocol) [Commun.Theor.Phys.49 (2008) 103] on the quantum secure directcommunication with W state (C-protocol) [Chin.Phys.Lett.23 (2006) 290] is proposed by Yuan et al.The quantum biterror rate induced by eavesdropper is 4.17% in C-protocol and 6.25% in Y-protocol.In this paper,another improvementon C-protocol is given.The quantum bit error rate of the eavesdropping will increase to 8.75%,which is 1.1 times largerthan that in C-protocol and 0.4 times larger than that in Y-protocol.

An improvement (Y-protocol) [Commun. The.Phys.49 (2008) 103] on the quantum secure direct communication with W state (C-protocol) [Chin.Phys.Lett.23 (2006) 290] is proposed by Yuan et al. The quantum biterror rate induced by eavesdropper is 4.17% in C-protocol and 6.25% in Y- protocol. In this paper, another improvement on C-protocol is given. The quantum bit error rate of the eavesdropping will increase to 8.75% , which is 1.1 times largerthan that in C-protocol and 0.4 times larger than that in Y-protocol.