| Entanglement evolution of three-qubit mixed states in multipartite cavity—reservoir systems |
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| 引用本文： | 许景周,郭金宝,文伟,白彦魁,闫凤利.Entanglement evolution of three-qubit mixed states in multipartite cavity—reservoir systems[J].中国物理 B,2012,21(8):80305-080305. |
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| 作者姓名： | 许景周 郭金宝 文伟 白彦魁 闫凤利 |
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| 作者单位： | College of Physical Science and Information Engineering and Hebei Advance Thin Films Laboratory, Hebei Normal University;State Key Laboratory of Superlattices and Microstructures,Institute of Semiconductors, Chinese Academy of Sciences |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （Grant Nos. 10905016 and 10971247）, the Natural Science Foundation of Hebei Province of China （Grant Nos. A2012205062, A2012205013, and A2010000344）, and the Fund of Hebei Normal University. |
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| 摘 要： | We analyze the multipartite entanglement evolution of three-qubit mixed states composed of a GHZ state and a W state.For a composite system consisting of three cavities interacting with independent reservoirs,it is shown that the entanglement evolution is restricted by a set of monogamy relations.Furthermore,as quantified by the negativity,the entanglement dynamical property of the mixed entangled state of cavity photons is investigated.It is found that the three cavity photons can exhibit the phenomenon of entanglement sudden death(ESD).However,compared with the evolution of a generalized three-qubit GHZ state which has the equal initial entanglement,the ESD time of mixed states is later than that of the pure state.Finally,we discuss the entanglement distribution in the multipartite system,and point out the intrinsic relation between the ESD of cavity photons and the entanglement sudden birth of reservoirs.
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| 关 键 词： | entanglement evolution three-qubit mixed states cavity-reservoir systems |
| 收稿时间： | 2012-02-02 |
Entanglement evolution of three-qubit mixed states in multipartite cavity-reservoir systems |
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| Xu Jing-Zhou,Guo Jin-Bao,Wen Wei,Bai Yan-Kui,Yan Feng-Li.Entanglement evolution of three-qubit mixed states in multipartite cavity-reservoir systems[J].Chinese Physics B,2012,21(8):80305-080305. |
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| Authors: | Xu Jing-Zhou Guo Jin-Bao Wen Wei Bai Yan-Kui Yan Feng-Li |
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| Institution: | a College of Physical Science and Information Engineering and Hebei Advance Thin Films Laboratory, Hebei Normal University, Shijiazhuang 050016, China;b State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P. O. Box 912, Beijing 100083, China |
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| Abstract: | We analyze the multipartite entanglement evolution of three-qubit mixed states composed of a GHZ state and a W state. For a composite system consisting of three cavities interacting with independent reservoirs, it is shown that the entanglement evolution is restricted by a set of monogamy relations. Furthermore, as quantified by the negativity, the entanglement dynamical property of the mixed entangled state of cavity photons is investigated. It is found that the three cavity photons can exhibit the phenomenon of entanglement sudden death (ESD). However, compared with the evolution of a generalized three-qubit GHZ state which has the equal initial entanglement, the ESD time of mixed states is latter than that of the pure state. Finally, we discuss the entanglement distribution in the multipartite system, and point out the intrinsic relation between the ESD of cavity photons and the entanglement sudden birth of reservoirs. |
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| Keywords: | entanglement evolution three-qubit mixed states cavity-reservoir systems |
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