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The checkerboard family of entangled states of two qutrits

100%
Ðoković D.
Open Physics
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2011
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vol. 9
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issue 1
65-70
EN
By modifying the method of Bruß and Peres, we construct two new families of entangled two qutrit states. For all density matrices ρ in these families we have ρ ij = 0 for i + j odd. The first family depends on 27 independent real parameters and includes both PPT and NPT states. The second family consists of PPT entangled states. The number of independent real parameters of this family is ≥ 11
2
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Entanglement conditions for four-mode states via the uncertainty relations in conjunction with partial transposition

88%
Song L., Wang X., Yan D., Li Y.
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|
vol. 6
|
issue 2
199-204
EN
From the Heisenberg uncertainty relation in conjunction with partial transposition, we derive a class of inequalities for detecting entanglements in four-mode states. The sufficient conditions for bipartite entangled states are presented. We also discuss the generalization of the entanglement conditions via the Schrödinger-Robertson indeterminacy relation, which are in general stronger than those based on the Heisenberg uncertainty relation.
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