摘要
计算Werner态对Bell不等式的最大违背及其用互信息和相对熵度量的关联。计算结果表明:对Werner态使Bell不等式有最大违背的测量恰能从其中提取最多信息;在关联的两种度量方法下,quantum discord描述的量子关联均大于经典关联,而纠缠描述的量子关联甚至在Bell不等式有最大违背的情况下也不一定大于经典关联。这说明quantum discord比量子纠缠能更好地描述关联的非定域性,从而使其在量子通信和量子计算中有更广泛的应用。
The maximal violation of Bell inequality and correlations measured by mutual information and relative entropy for the Werner state are calculated. It is found that the measurements that result in the maximal violation of Bell inequality can extract the most information from the Werner state;in the two kinds of measures of correlation,quantum discord is all greater than classical correlation, whereas entanglement does not necessarily greater than classical correlation even in the case of the maximal violation of Bell inequality, which means that quantum discord.can describe the nonlocality of correlation much better than entanglement so that makes it have wider application in quantum communication and quantum computation.
出处
《济南大学学报（自然科学版）》
CAS
北大核心
2011年第1期94-97,共4页
Journal of University of Jinan(Science and Technology)
基金
山东省青年教师国内访问学者与国际合作培养计划
教育部高等学校青年骨干教师国内访问学者计划
关键词
混态
量子纠缠
关联
互信息
mixed state
quantum entanglement
correlation
mutual information
