Witnessing multipartite entanglement
arXiv:quant-ph/0309043 · doi:10.1103/PhysRevLett.92.087902
Abstract
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.
4 pages, 2 figures