海森伯格XXZ模型在DM作用下的负值度  

Negativity in Heisenberg XXZ Model with DM Interaction

作　　者：刘思平[1] 

机构地区：[1]襄樊学院物理与电子工程学院,湖北襄樊441053

出　　处：《绵阳师范学院学报》2010年第8期20-23,共4页Journal of Mianyang Teachers＇ College

基　　金：湖北省教育厅科学技术研究计划优秀中青年人才项目(Q20082503)

摘　　要：利用负值度研究在外加磁场和DM相互作用下两量子比特海森伯格XXZ模型的热纠缠,仔细讨论了温度、磁场和DM系数对纠缠程度的影响。在临界温度以上纠缠消失,小于临界温度时,负值度随DM系数的增加而增大,在系数D一定时,负值度随外加磁场的增加而减少,存在一个临界磁场。By using Negativity the author studies the thermal entanglement of two - qubit Heisenberg XXZ model under DM interaction. Tile author discusses in detail the effects of temperature T, external magnetic field B and DM parameter on the entanglement. When file temperature is higher than a critical temperature TC the entanglement disappears. The Negativity increases with the increase of the DM parameter when the temperature is lower than TC. The Negativity decreases with the＇increase of external magnetic field when D is constant. There is a crit- ical magnetic field.

关 键 词：热纠缠 海森伯格模型 负值度 量子比特 

分 类 号：O431[机械工程—光学工程]