Experimental analysis of a four-qubit photon cluster state.
Linear-optics quantum logic operations enabled the observation of a four-photon cluster state. We prove genuine four-partite entanglement and study its persistency, demonstrating remarkable differences from the usual Greenberger-Horne-Zeilinger (GHZ) state. Efficient analysis tools are introduced in the experiment, which will be of great importance in further studies on multiparticle entangled states.
Kiesel
Nikolai
N
Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
Schmid
Christian
C
Weber
Ulrich
U
Tóth
Géza
G
Gühne
Otfried
O
Ursin
Rupert
R
Weinfurter
Harald
H