Witnessing multipartite entanglement

Anna Sanpera; Christian Kurtsiefer; Dagmar Bruss; Harald Weinfurter; Maciej Lewenstein; Manfred Eibl; Mohamed Bourennane; Otfried Guehne; Philipp Hyllus; Sascha Gaertner

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arxiv quant-ph/0309043 v2 pith:D4KFNACM submitted 2003-09-03 quant-ph

Witnessing multipartite entanglement

Mohamed Bourennane , Manfred Eibl , Christian Kurtsiefer , Sascha Gaertner , Harald Weinfurter , Otfried Guehne , Philipp Hyllus , Dagmar Bruss

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Maciej Lewenstein Anna Sanpera

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keywords entanglementmultipartiteexperimentaloperatorsstateswitnessapplycanonical

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We present the experimental detection of genuine multipartite entanglement using entanglement witness operators. To this aim we introduce a canonical way of constructing and decomposing witness operators so that they can be directly implemented with present technology. We apply this method to three- and four-qubit entangled states of polarized photons, giving experimental evidence that the considered states contain true multipartite entanglement.

Witnessing multipartite entanglement

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