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Nonlinear entanglement witnesses, covariance matrices and the geometry of separable states
Otfried Gühne, Norbert Lütkenhaus
Entanglement witnesses provide a standard tool for the analysis of entanglement in experiments. We investigate possible nonlinear entanglement witnesses from several perspectives.…
Experimental entanglement of six photons in graph states
Chao-Yang Lu, Xiao-Qi Zhou, Otfried Gühne +6
Graph states are special kinds of multipartite entangled states that correspond to mathematical graphs where the vertices take the role of quantum spin systems and the edges repres…
Entanglement criteria based on local uncertainty relations are strictly stronger than the computable cross norm criterion
Otfried Gühne, Matyas Mechler, Geza Toth +1
We show that any state which violates the computable cross norm (or realignment) criterion for separability also violates the separability criterion of the local uncertainty relati…
Detection of multipartite entanglement with two-body correlations
Geza Toth, Otfried Gühne
We show how to detect entanglement with criteria built from simple two-body correlation terms. Since many natural Hamiltonians are sums of such correlation terms, our ideas can be…