Multipartite entanglement detection via structure factors

Multipartite entanglement detection via structure factors

We establish a relation between entanglement of a many-body system and its diffractive properties, where the link is given by structure factors. Based on these, we provide a general analytical construction of multiqubit entanglement witnesses. The proposed witnesses contain two-point correlations. T...

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Veröffentlicht in:Physical review letters 2009-09, Vol.103 (10), p.100502-100502, Article 100502
Hauptverfasser: Krammer, Philipp, Kampermann, Hermann, Bruss, Dagmar, Bertlmann, Reinhold A, Kwek, Leong Chuang, Macchiavello, Chiara
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container_end_page 100502
container_issue 10
container_start_page 100502
container_title Physical review letters
container_volume 103
creator Krammer, Philipp
Kampermann, Hermann
Bruss, Dagmar
Bertlmann, Reinhold A
Kwek, Leong Chuang
Macchiavello, Chiara
description We establish a relation between entanglement of a many-body system and its diffractive properties, where the link is given by structure factors. Based on these, we provide a general analytical construction of multiqubit entanglement witnesses. The proposed witnesses contain two-point correlations. They could be either measured in a scattering experiment or via local measurements, depending on the underlying physical system. For some explicit examples of witnesses we analyze the properties of the states that are detected by them. We further study the robustness of these witnesses with respect to noise.
doi_str_mv 10.1103/PhysRevLett.103.100502
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