一类X-态量子关联的几何测量  

Geometric measurement of quantum correlation for a kind of X-state

作　　者：桂卫军[1] 江民斌[2] 

机构地区：[1]南昌工程学院理学系,江西南昌330099 [2]南昌工程学院计算机科学与技术系,江西南昌330099

出　　处：《量子电子学报》2011年第4期446-450,共5页Chinese Journal of Quantum Electronics

摘　　要：量子不谐和(Quantum discord,QD)常被用来描述量子体系的量子关联。基于QD几何测量方法,求解了只含一个变量参数X-态的量子关联,并给出在三种不同量子通道中该体系量子关联的具体形式。通过针对减振幅通道中对该X-态的纠缠度以及量子关联的抗消相干能力比较,用图示的方法显示出量子关联具有比纠缠更强的抗消相干能力。Quantum discord（QD） can be used to characterize quantum correlation of a quantum system. Based on geometric measurement of QD（GMQD）,quantum correlation of the single-parameter X- state was calculated,and the results for the case were also given under three different quantum channels.For the amplitude-damping channel,by comparing concurrence and GMQD of the X-state mentioned above using graphical method,it’s concluded that GMQD exhibits more robust than concurrence when the quantum system is exposed to environment.

关 键 词：量子光学 X-态 量子关联 几何测量 

分 类 号：O431[机械工程—光学工程]