Genuine entanglement of generalized Bell diagonal states

We present a necessary condition for genuine entanglement of generalized Bell diagonal states in multiqubit systems. This condition has also been generalized into a general case with some restrictions, based on the direct sum representation of certain density matrices, and we show that generalized B...

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Bibliographic Details
Published inPhysics letters. A Vol. 363; no. 1; pp. 57 - 65
Main Authors Zhang, Cheng-Jie, Zhang, Yong-Sheng, Guo, Guang-Can
Format Journal Article
LanguageEnglish
Published Elsevier B.V 19.03.2007
Subjects
03.67.Mn
03.65.Ud
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Summary:We present a necessary condition for genuine entanglement of generalized Bell diagonal states in multiqubit systems. This condition has also been generalized into a general case with some restrictions, based on the direct sum representation of certain density matrices, and we show that generalized Bell diagonal states can be represented by the direct sum form.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2006.10.063