| Quantum Secure Direct Communication with W State |
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| 作者姓名： | 曹海静 宋鹤山 |
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| 作者单位： | Department of Physics, Dalian University of Technology, Dalian 116024 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant No 60472017. |
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| 摘 要： |
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| 关 键 词： | W态 量子信道 经典通信 秘密信息 直接通信 |
| 收稿时间： | 2005-09-29 |
| 修稿时间： | 2005-09-29 |
Quantum Secure Direct Communication with W State |
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| CAO Hai-Jing, SONG He-Shan.Quantum Secure Direct Communication with W State[J].Chinese Physics Letters,2006,23(2):290-292. |
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| Authors: | CAO Hai-Jing SONG He-Shan |
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| Abstract: | A new theoretical scheme for quantum secure direct communication is proposed, where four-qubit symmetric W state functions as quantum channel. It is shown that two legitimate users can directly transmit the secret messages by using Bell-basis measurements and classical communication. The scheme is completely secure if the quantum channel is perfect. Even if the quantum channel is unsecured, it is still possible for two users to perform their secure communication. One bit secret message can be transmitted by sending a bit classical information. |
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