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Experimental Detection of Multipartite Entanglement using Witness Operators

2004; American Physical Society; Volume: 92; Issue: 8 Linguagem: Inglês

10.1103/physrevlett.92.087902

1092-0145

Mohamed Bourennane, Manfred Eibl, Christian Kurtsiefer, Sascha Gaertner, Harald Weinfurter, Otfried Gühne, Philipp Hyllus, Dagmar Bruß, Maciej Lewenstein, Anna Sanpera,

Quantum Computing Algorithms and Architecture

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.