| Efficient Quantum Cryptography Network without Entanglement and Quantum Memory |
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| 作者姓名： | 李春燕 李熙涵 邓富国 周萍 梁玉洁 周宏余 |
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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 10604008, 10435020, 10254002 and A0325401, and the Beijing Education Committee under Grant No XK100270454. |
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| 摘 要： | An efficient quantum cryptography network protocol is proposed with d-dimensional polarized photons, without resorting to entanglement and quantum memory. A server on the network, say Alice, provides the service for preparing and measuring single photons whose initial state are ｜0〉. The users code the information on the single photons with some unitary operations. To prevent the untrustworthy server Alice from eavesdropping the quantum lines, a nonorthogonal-coding technique is used in the process that the quantum signal is transmitted between the users. This protocol does not require the servers and the users to store the quantum states and almost all of the single photons can be used for carrying the information, which makes it more convenient for application than others with present technology. We also discuss the case with a faint laser pulse.
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| 关 键 词： | 有效量子加密网络 纠缠 量子记忆 单光子 |
| 收稿时间： | 2006-06-09 |
| 修稿时间： | 2006-06-09 |
Efficient Quantum Cryptography Network without Entanglement and Quantum Memory |
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| LI Chun-Yan, LI Xi-Han, DENG Fu-Guo,ZHOU Ping, LIANG Yu-Jie,ZHOU Hong-Yu.Efficient Quantum Cryptography Network without Entanglement and Quantum Memory[J].Chinese Physics Letters,2006,23(11):2896-2899. |
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| Authors: | LI Chun-Yan LI Xi-Han DENG Fu-Guo ZHOU Ping LIANG Yu-Jie ZHOU Hong-Yu |
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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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