Optimal entanglement witnesses from generalized reduction and Robertson maps

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Abstract

We provide a generalization of the reduction and Robertson positive maps in matrix algebras. They give rise to a new class of optimal entanglement witnesses. Their structural physical approximation is analyzed. As a byproduct we provide a new examples of PPT (Positive Partial Transpose) entangled states.

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Quantum Physics, Mathematical Physics

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J. Phys. A: Math. Theor. 44 (2011) 165304

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