A characterization of optimal entanglement witnesses

Details A characterization of optimal entanglement witnesses A characterization of optimal entanglement witnesses

2011-09-11

arxiv.org/abs/1109.2300v1

Phy. Rev. A, 85, 022334 (2012)

Physics

Quantum Physics

15

Scientific paper

In this paper, we present a characterization of optimal entanglement witnesses in terms of positive maps and then provide a general method of checking optimality of entanglement witnesses. Applying it, we obtain new indecomposable optimal witnesses which have no spanning property. These also provide new examples which support a recent conjecture saying that the so-called structural physical approximations to optimal positive maps (optimal entanglement witnesses) give entanglement breaking maps (separable states).

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