非线性相互作用下三qubit系统中的量子关联  

Quantum correlations of a three-qubit system based on nonlinear interaction models

作　　者：刘万芳[1] 陈逢林[1] 马业万[1] 

机构地区：[1]安庆师范学院物理与电气工程学院

出　　处：《原子与分子物理学报》2017年第2期311-317,共7页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金理论物理专项基金(11447174);安徽省自然科学基金(1408085QA15;1308085QA19);安徽省教育厅重点项目(KJ2015A266;KJ2015A223)

摘　　要：通过对系统施加不同的非线性作用,利用量子关联的几何度量,研究了三个qubit体系中的两体量子关联.不同的非线性相互作用模型都能使系统产生最大值为0.1752的量子关联.z方向的横场对量子关联的优化有控制作用,对于三个模型,通过调节z方向的横场,系统能产生最大值为0.09645的平均量子关联.最佳组合的三个横场,不仅能够大幅度提高量子关联的振荡周期,使得两qubit长时间处于量子关联态,而且还能够提高两qubit的平均量子关联.Quantum correlation has been studied in a three-qubit system implemented three nonlinear interaction models with external field. Three modes can generate the quantum correlation with the maximal value 0.1752. The external field of z-axis can control the optimization of average quantum correlation, and a appropriate strength can generate the maximal average quantum correlation. Due to a optimal combination of the three external fields, oscillation period of the quantum correlation can be improve intrinsically, and system stay on the states with the quantum correlation in a much longer time interval. Another vantage the optimal combination is that it improve the average quantum correlation.

关 键 词：非线性相互作用模型 横场 量子关联的几何度量 平均量子关联 

分 类 号：O431.2[机械工程—光学工程]