相因子对GHZ态结构和自旋相互能量的影响  

Influence of relative phase on the configuration and spin-spin interaction energy of GHZ state

作　　者：李元杰[1] 何正红[1] 

机构地区：[1]华中科技大学物理系,湖北武汉430074

出　　处：《量子电子学报》2004年第6期763-766,共4页Chinese Journal of Quantum Electronics

摘　　要：根据多粒子相干纠缠态得到一般的多粒子GHZ态模型,并利用Wigner函数绘出了相空间的准概率分布图像。然后通过各个直积态的本征态的本征值来计算总的自旋相互作用能量。此外,当相因子变化时,GHZ的结构和能量的变化得到观察与分析。最后,根据稳定性与能量的关系,从能量的角度进一步验证了全同性原理费米子的特征。计算Wigner函数时,我们利用了Matlab语言的Qotoolbox工具包在向量空间中绘出其图形,这比解析的方法更快捷、方便。We set out to find the generic multipartite GHZ state from the multipartite entangled coherent states, which is composed of fermions. The figures of quasi-probability distribution of Wigner function of the GHZ state are worked out. The interaction energy of GHZ is computed through the eigenvalues of their eigenstates. When the phase factor changes from 0 to π, the variance of the configuration and interaction energy is analyzed. We compute the Wigner function using the Qotoolbox of Matlab computer language, which creates the orthogonal bases on the vector space. The way in which we compute the Wigner function is more convenient than others. Finally we validated the principle of identical particles, which is one of the assumptions of quantum mechanics.

关 键 词：量子光学 自旋相互作用 GHZ态 WIGNER分布 纠缠态 

分 类 号：O431.2[机械工程—光学工程]