2,550 research outputs found
Improved lower bounds on genuine-multipartite-entanglement concurrence
Genuine-multipartite-entanglement (GME) concurrence is a measure of genuine
multipartite entanglement that generalizes the well-known notion of
concurrence. We define an observable for GME concurrence. The observable
permits us to avoid full state tomography and leads to different analytic lower
bounds. By means of explicit examples we show that entanglement criteria based
on the bounds have a better performance with respect to the known methods.Comment: 17 pages, 1 EPS figure; v3 is in one column to improve readability of
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Measure of genuine multipartite entanglement with computable lower bounds
We introduce an intuitive measure of genuine multipartite entanglement which
is based on the well-known concurrence. We show how lower bounds on this
measure can be derived that also meet important characteristics of an
entanglement measure. These lower bounds are experimentally implementable in a
feasible way enabling quantification of multipartite entanglement in a broad
variety of cases.Comment: 5 pages, 2 figure
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