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国家自然科学基金(60525417)

作品数:3 被引量:4H指数:1
相关作者:刘伍明惠小强岳瑞宏张涛更多>>
相关机构:中国科学院西北大学西安邮电学院更多>>
发文基金:国家自然科学基金山西省自然科学基金陕西省自然科学基金更多>>
相关领域:理学机械工程更多>>

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海森堡模型中的对纠缠和局域极化
2008年
通过研究有限位的海森堡XX模型的基态,讨论了对纠缠和局域极化的一些性质.结果表明:基态是由具有最小总自旋0(偶量子位)或1/2(奇量子位)的微观态所组成,局域极化和微观态在基态中所占的比率密切相关,比率越小的局域极化越强,比率相同的则局域极化也相同;基态的对纠缠是所有本征态中最大的.当量子位比较小的时候,态的简并将会减小对纠缠,量子位的奇偶性对对纠缠有很大的影响;随着量子位的增加,位数对对纠缠的影响越来越小,奇数位链的对纠缠极限约是0.3412,偶数位链的对纠缠极限约是0.3491.
惠小强张涛岳瑞宏刘伍明
Pairwise entanglement and local polarization of Heisenberg model被引量:4
2008年
The characteristics of pairwise entanglement and local polarization (LP) are dis-cussed by studying the ground state (states) of the Heisenberg XX model. The re-sults show that: the ground state (states) is (are) composed of the micro states with the minimal polarization (0 for even qubit and 1/2 for odd qubit); LP and the prob-ability of the micro state have an intimate relation, i.e. the stronger the LP, the smaller the probability, and the same LP corresponds to the same probability; the pairwise entanglement of the ground state is the biggest in all eigenvectors. It is found that the pairwise entanglement is decreased by the state degeneracy and the system size. The concurrence approaches a fixed value of about 0.3412 (for odd-qubit chain) or 0.3491 (for even-qubit chain) if the qubit number is large enough.
XI XiaoQiang1,2, ZHANG Tao3, YUE RuiHong3,4 & LIU WuMing2 1 Department of Applied Mathematics and Physics, Xi’an Institute of Post and Telecommunications, Xi’an 710061, China
关键词:HEISENBERGMODELLOCALPOLARIZATIONENTANGLEMENT
Internal Josephson-like tunnelling in two-component Bose-Einstein condensates affected by sign of the atomic interaction and external trapping potential
2007年
This paper studies the Josephson-like tunnelling in two-component Bose-Einstein condensates coupled with microwave field, which is in respond to various attractive and repulsive atomic interaction under the various aspect ratio of trapping potential. It is very interesting to find that the dynamic of Josephson-like tunnelling can be controlled from fast damped oscillations to nondamped oscillation, and relative number of atoms changes from asymmetric occupation to symmetric occupation correspondingly.
熊波刘循序
关键词:BOSE-EINSTEIN
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