Threshold Quantum Secret Sharing of Secure Direct Communication |
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| Authors: | LI Bao-Kui YANG Yu-Guang WEN Qiao-Yan |
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| Affiliation: | [1]Department of Automatic Control School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081 [2]College of Computer Science and Technology, Beijing University of Technology, Beijing 100124 [3]State Key Laboratory of Integrated Services Network, Xidian University, Xi＇an 710071 [4]State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing 100049 [5]State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876 |
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| Abstract: | We propose a (t,n)-threshold quantum secret sharing protocol of secure direct communication following some ideas of Zhang's protocol [Phys. Lett. A 342 (2005) 60] and Tokunaga et al.'s protocol [Phys. Rev. A 71 (2005) 012314]. The sender distributes the classical secret shares to his or her n agents and each agent owns a secret share in advance. The sender's secure direct communication message can be extracted by an agent subset by collaboration in such a way that at least t or more agents can obtain the secret message with the mutual assistances but any t-1 or fewer agents cannot. In contrast to the previous multiparty quantum secret sharing protocols in which the sender's secret message can be recovered only if all the agents collaborate, our protocol is more practical and more flexible |
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| Keywords: | 03.67.Hk 03.65.Ud |
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