Experimental detection of multipartite entanglement using witness operators.
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.
Bourennane
Mohamed
M
Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
Eibl
Manfred
M
Kurtsiefer
Christian
C
Gaertner
Sascha
S
Weinfurter
Harald
H
Gühne
Otfried
O
Hyllus
Philipp
P
Bruss
Dagmar
D
Lewenstein
Maciej
M
Sanpera
Anna
A