收录：
摘要：
A necessary condition of entanglement for tripartite 2⊗2⊗3 Bell diagonal states and a sufficient condition of entanglement for 3⊗3⊗3 Bell diagonal states are presented. Moreover, the relation between entanglement of 3⊗3⊗3 Bell diagonal states and partial transpose of density matrix is investigated. And an analytical expression of negative for Bell diagonal states is presented.
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来源 ：
Journal of Beijing University of Technology
ISSN： 0254-0037
年份： 2011
期： 2
卷： 37
页码： 306-313
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