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论文类型：期刊论文

发表时间：2012-03-29

发表刊物：PHYSICAL REVIEW A

收录刊物：SCIE、EI、Scopus

卷号：85

期号：3

ISSN号：1050-2947

摘要：In this paper, we show that the average three-tangle of the reduced tripartite density matrix for some quadripartite pure states can be increased by some potential measurements on the fourth subsystem, which means this type of quadripartite entanglement can be localized. In particular, we prove that the maximal increment with all potential measurements taken into account is a quadripartite entanglement monotone, so it quantifies this localized quadripartite entanglement. By analyzing quadripartite pure states based on the previous classification, we find that this quadripartite entanglement monotone not only present is in the standard Greenberger-Horne-Zeilinger state but also is absent in the standard W states. In addition, based on the proposed entanglement measure, we construct a monogamy relation.