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论文类型：期刊论文

发表时间：2013-10-29

发表刊物：EUROPEAN PHYSICAL JOURNAL D

收录刊物：SCIE

卷号：67

期号：10

ISSN号：1434-6060

摘要：We study the nonclassical correlations in a two-qubit state by the perturbing local unitary operation method. We find that the definitions of various non-classicalities including quantum discord (QD), measurement-induced nonlocality (MIN) and so on usually do not have a unique definition when expressed as the perturbation of local unitary operations, so a given non-classicality can lead to different definitions of its dual non-classicality. In addition, it is shown that QD and MIN are not the corresponding dual expressions in a simple set of unitary operations, even though they are in their original definitions. In addition, we also consider the non-classicalities in general 2 circle times d dimensional systems.