An Improved Quantum Information Hiding Protocol Based on Entanglement Swapping of χ-type Quantum States  

作　　者：徐淑奖 陈秀波 王连海 丁青艳 张淑慧 

机构地区：[1]Shandong Provincial Key Laboratory of Computer Networks, Shandong Computer Science Center (National Supercomputer Center in Jinan) [2]Information Security Center, State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications

出　　处：《Communications in Theoretical Physics》2016年第6期705-710,共6页理论物理通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos.61572297,61303199,61272514,and 61373131;the Shandong Provincial Natural Science Foundation of China under Grant Nos.ZR2013FM025,ZR2013FQ001;ZR2014FM003,and ZY2015YL018;the Shandong Provincial Outstanding Research Award Fund for Young Scientists of China under Grant Nos.BS2015DX006and BS2014DX007;the National Development Foundation for Cryptological Research,China under Grant No.MMJJ201401012;the Priority Academic Program Development of Jiangsu Higher Education Institutions and Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology Funds;the Shandong Academy of Sciences Youth Fund Project,China under Grant Nos.2015QN003 and 2013QN007

摘　　要：In 2011, Qu et al. proposed a quantum information hiding protocol based on the entanglement swapping of χ-type quantum states. Because a χ-type state can be described by the 4-particle cat states which have good symmetry,the possible output results of the entanglement swapping between a given χ-type state and all of the 16 χ-type states are divided into 8 groups instead of 16 groups of different results when the global phase is not considered. So it is difficult to read out the secret messages since each result occurs twice in each line(column) of the secret messages encoding rule for the original protocol. In fact, a 3-bit instead of a 4-bit secret message can be encoded by performing two unitary transformations on 2 particles of a χ-type quantum state in the original protocol. To overcome this defect, we propose an improved quantum information hiding protocol based on the general term formulas of the entanglement swapping among χ-type states.

关 键 词：quantum communication quantum information hiding χ-type quantum state entanglement swapping 

分 类 号：O413[理学—理论物理] TP309[理学—物理]