| Capacity of a Simultaneous Quantum Secure Direct Communication Scheme between the Central Party and Other M Parties |
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| 作者姓名： | 高亭 闫凤利 王志玺 李有成 |
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| 作者单位： | [1]College of Mathematics and Information Science, Hebei Normal University, Shijiazhuang 050016 [2]CCAST （World Laboratory）, PO Box 8730, Beijing 100080 [3]College of Physics and Information Engineering, Hebei Normal University, Shijiazhuang 050016 [4]Department of Mathematics, Capital Normal University, Beijing 100037 |
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| 基金项目： | Supported by the Natural Science Foundation of Hebei Province under Grant Nos A2004000141 and A2005000140, and the Natural Science Foundation of Hebei Normal University. |
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| 摘 要： | We analyse the capacity of a simultaneous quantum secure direct communication scheme between the central party and other M parties via M＋1-particle GHZ states and swapping quantum entanglement. It is shown that the encoding scheme should be secret if other M parties wants to transmit M ＋ 1 bit classical messages to the centre party secretly. However, when the encoding scheme is announced publicly, we prove that the capacity of the scheme in transmitting the secret messages is 2 bits, no matter how large M is.
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| 关 键 词： | 容量 量子加密直接通信 M粒子 量子纠缠 |
| 收稿时间： | 2006-04-20 |
| 修稿时间： | 2006-04-20 |
Capacity of a Simultaneous Quantum Secure Direct Communication Scheme between the Central Party and Other M Parties |
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| GAO Ting, YAN Feng-Li, WANG Zhi-Xi, LI You-Cheng, PO Box , Beijing ; College of Physics and Information Engineering, Hebei Normal University, Shijiazhuang ;.Capacity of a Simultaneous Quantum Secure Direct Communication Scheme between the Central Party and Other M Parties[J].Chinese Physics Letters,2006,23(10):2656-2657. |
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| Authors: | GAO Ting YAN Feng-Li WANG Zhi-Xi LI You-Cheng PO Box Beijing ; College of Physics and Information Engineering Hebei Normal University Shijiazhuang ; |
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| Institution: | 1 College of Mathematics and Information Science, Hebei Normal University, Shijiazhuang 050016; 2 CCAST (World Laboratory |
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