n以及电子 初态对纠缠演化特性及系统冯诺依曼熵的影响. 数值计算结果表明: 1)纠缠度随时间的演化呈现出良好的周期性, 当其他的参数固定时, 演化周期随耦合强度g增大逐渐减小, 与平均声子数n无关; 2)系统冯诺依曼熵同电子状态占有率表现出严格的同步演化特性; (3) 在弱耦合强度和低平均声子数下, 初始电子态c2↑+ c2↓+|O>e或c1↑+ c1↓+ |O>e较c1↑+c2↓+–c1↓+ c2↑+具有更大的最大冯诺依曼熵, 并随耦合强度增大、平均声子数的增加而逐渐接近.

"/>         n and the initial electronic state on the evolution of system entanglement and von Neumann entropy are discussed. Numerical results are as follows. (a) Entanglement evolution with time shows a good periodicity. When the other parameters are fixed, the evolution period decreases as the coupling strength g goes up but it is independent of the average number of phonons n. (b) The von Neumann entropy of the system demonstrates strict synchronia with the electronic state occupancy probability. (c) Under the weak coupling strength and low average number of phonons, the initial electronic state c2↑+ c2↓+|O>e or c1↑+ c1↓+|O>e shows larger maximum von Neumann entropy during its evolution than that of c1↑+c2↓+–c1↓+c2↑++ but they gradually approach to each other with the increase of coupling strength or average number of phonons.

"/>     两格点两电子Hubbard-Holstein模型极化子的量子纠缠特性
物理学报
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物理学报  2012, Vol. 61 Issue (12): 124207     doi:10.7498/aps.61.124207
电磁学、光学、声学、传热学、经典力学和流体动力学 当期目录| 过刊浏览| 高级检索     
两格点两电子Hubbard-Holstein模型极化子的量子纠缠特性
任学藻1, 贺树1, 丛红璐2, 王旭文1
1. 西南科技大学理学院, 四川,绵阳 621010;
2. 北京交通大学海滨学院, 河北,黄骅 061100
Two-site Hubbard-holstein model polaron of quantum entanglement properties
Ren Xue-Zao1, He Shu1, Cong Hong-Lu2, Wang Xu-Wen1
School of Science, Southwest University of Science and Technology, Mianyang 621010, China

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