Iterations of nonlinear entanglement witnesses

Details Iterations of nonlinear entanglement witnesses Iterations of nonlinear entanglement witnesses

2008-06-04

arxiv.org/abs/0806.0855v1

Phys. Rev. A 78, 032326 (2008)

Physics

Quantum Physics

11 pages, 5 figures

Scientific paper

10.1103/PhysRevA.78.032326

We describe a generic way to improve a given linear entanglement witness by a quadratic, nonlinear term. This method can be iterated, leading to a whole sequence of nonlinear witnesses, which become stronger in each step of the iteration. We show how to optimize this iteration with respect to a given state, and prove that in the limit of the iteration the nonlinear witness detects all states that can be detected by the positive map corresponding to the original linear witness.

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