Separability in 2×N composite quantum systems

B. Kraus, J. I. Cirac, S. Karnas, M. Lewenstein

Research output: Contribution to journalArticlepeer-review

113 Scopus citations


The separability properties of density operators acting on C2⊗CN and with positive partial transpose were studied. A necessary and sufficient criterion for separability of generic low-rank density operators ρ was derived. The resulting criterion requires findings roots of complex polynomials, that give rise to all the product vectors in the ranges of ρ and ρT(A).

Original languageEnglish
Pages (from-to)62302-62301
Number of pages2
JournalPhysical Review A
Issue number6
StatePublished - 2000
Externally publishedYes


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