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arxiv: quant-ph/0309043 · v2 · submitted 2003-09-03 · 🪐 quant-ph

Witnessing multipartite entanglement

classification 🪐 quant-ph
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.

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