Experimental detection of multipartite entanglement using witness operators.

Authors :: Bourennane M
Eibl M
Kurtsiefer C
Gaertner S
Weinfurter H
Gühne O
Hyllus P
Bruss D
Lewenstein M
Sanpera A
Source :: Physical review letters [Phys Rev Lett] 2004 Feb 27; Vol. 92 (8), pp. 087902. Date of Electronic Publication: 2004 Feb 26.
Publication Year :: 2004
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.