Experimental detection of multipartite entanglement using witness operators.

By Mohamed Bourennane, Manfred Eibl, Christian Kurtsiefer, S. Gaertner, Harald Weinfurter, Otfried Gühne, P. Hyllus, D. Bruß, Maciej Lewenstein, Anna Sanpera. Physical Review Letters, 2003

382 citations recorded by the source corpus.

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.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/c1ff2b5f77b223565426894d9bb80b6e514ae504

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Citations in the corpus

Experimental entanglement of six photons in graph states (2006, methodology): “To prove multipartite entanglement, we use the method of entanglement witnesse”
Three-photon energy–time entanglement (2012, background): “For pure states full inseparability implies genuine tripartite entanglement[25].”
Entanglement certification from theory to experiment (2018, neutral): “For instance, for a pure target state |ψT〉, computing all marginal eigenvalues allows defining a witness [269] of the form WGME := maxαi ||ραi ||∞1 − |ψT〉〈ψT|.”
Observation of eight-photon entanglement (2011, background): “We can determine the fidelities of the cat states and detect the presence of genuine multipartite entanglemen”
Multiphoton entanglement and interferometry (2008, methodology): “Experimental realization of decoherence-free subspaces with photons was reported by Kwiat et al. (2000), Altepeter et al. (2004), and Bourennane et al. (2004), and applications of decoherence-free subspace were demonstrated for an optical quantum-computing algorithm (Mohseni et al., 2003) and for…”
Entanglement detection (2008, methodology): “[145] themaximum can be directly computed and is given by the square of the maximal Schmidt coefficient of |ψ〉.”
Experimental demonstration of a hyper-entangled ten-qubit Schr\ (2008, background): “For the cat states, it is sufficient to prove the presence of genuine multipartite entanglement (40,41) if their fidelities exceed the threshold of 0.”