1205.3119 (Jun-Yi Wu et al.)

Determining lower bounds on a measure of multipartite entanglement from
few local observables    [PDF]

Jun-Yi Wu, Hermann Kampermann, Dagmar Bruß, Claude Klöckl, Marcus Huber

We introduce a method to lower bound an entropy based measure of genuine multipartite entanglement via nonlinear entanglement witnesses. We show that some of these bounds are tight and explicitly work out their connection to a framework of nonlinear witnesses that were published recently. Furthermore we provide a detailed analysis of these lower bounds in the context of other possible bounds and measures. In exemplary cases we show that only few local measurements are necessary to determine these lower bounds.

View original: http://arxiv.org/abs/1205.3119