| Quantum Secure Direct Communication Network with Two-Step Protocol |
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| 作者姓名： | 李熙涵 周萍 梁玉洁 李春燕 周宏余 邓富国 |
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| 作者单位： | [1]The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, Beijing Normal University, Beijing 100875 [2]Institute of Low Energy Nuclear Physics, and Department of Material Science and Engineering, Beijing Normal University, Beijing 100875 [3]Beijing Radiation Center, Beijing 100875 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant Nos 10447106, 10435020, 10254002, A0325401 and 10374010, and Beijing Education Committee under Grant No XK100270454. |
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| 摘 要： | An efficient quantum secure direct communication network protocol with the two-step scheme is proposed by using the Einstein-Podolsky-Rosen （EPR） pair block as the quantum information carrier. The server, say Alice, prepares and measures the EPR pairs in the quantum communication and the users perform the four local unitary operations to encode their message. Anyone of the legitimate users can communicate another one on the network securely. Since almost all of the instances in this scheme are useful and each EPR pair can carry two bits of information, the efficiency for qubits and the source capacity both approach the maximal values.
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| 关 键 词： | 量子保密直接通信网络 二阶协议 量子信息 量子论 |
| 收稿时间： | 2006-02-14 |
| 修稿时间： | 2006-02-14 |
Quantum Secure Direct Communication Network with Two-Step Protocol |
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| LI Xi-Han, ZHOU Ping, LIANG Yu-Jie, LI Chun-Yan, ZHOU Hong-Yu, DENG Fu-Guo.Quantum Secure Direct Communication Network with Two-Step Protocol[J].Chinese Physics Letters,2006,23(5):1080-1083. |
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| Authors: | LI Xi-Han ZHOU Ping LIANG Yu-Jie LI Chun-Yan ZHOU Hong-Yu DENG Fu-Guo |
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| Institution: | 1 The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, Beijing Normal University, Beijing 100875; 2 Institute of Low Energy Nuclear Physics, and Department of Material Science and Engineering, Beijing Normal University, Beijing 100875; 3. Beijing Radiation Center, Beijing 100875 |
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