Entanglement detection and lower bound of convex-roof extension of negativity

Details Entanglement detection and lower bound of convex-roof extension of negativity Entanglement detection and lower bound of convex-roof extension of negativity

2011-12-30

arxiv.org/abs/1201.0053v1

J. Phys. A 45, Math. Theor. (2012) 035301

Physics

Quantum Physics

8 pages, 1 figure

Scientific paper

10.1088/1751-8113/45/3/035301

We present a set of inequalities based on mean values of quantum mechanical observables nonlinear entanglement witnesses for bipartite quantum systems. These inequalities give rise to sufficient and necessary conditions for separability of all bipartite pure states and even some mixed states. In terms of these mean values of quantum mechanical observables a measurable lower bound of the convex-roof extension of the negativity is derived.

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