摘要
量子失谐是近年来被发现的除量子纠缠外很重要的一种量子关联,是量子信息中两种表达式的差异.针对两体X-型量子态的量子失谐的研究有很多,但对两体非X-型量子态的研究较少.讨论一类含4个参数的两体非X-型量子态的量子失谐.通过对量子测量进行酉变换,得到经典量子关联.最后运用拉格朗日乘数法来求其量子失谐的极值,给出这类两体非X-型量子态量子失谐的解析解.
Quantum discord is an important quantum correlation except for quantum entanglement,which is discovered in recent years,and is the difference between two expressions in quantum information.For bipartite quantum states,there are many researches on quantum discord of X-states,while few the studies on non-X-states.We discuss the quantum discord of a class non-X-states with four parameters.By unitary transformation of quantum measurements,we obtain classical quantum correlations.The extreme of quantum discord is carried out by using Lagrange multiplier method.The analytical solutions of the quantum discord of these non-X-states are given out.
作者
张传彬
周建明
胡晓莉
ZHANG Chuanbin;ZHOU Jianming;HU Xiaoli(School of Mathematics and Computer Science,Jianghan University,Wuhan 430100,China)
出处
《湖北大学学报（自然科学版）》
CAS
2020年第1期113-116,F0003,共5页
Journal of Hubei University：Natural Science
基金
国家自然科学青年基金(11501251)资助
