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