Experimental Realization of a Three-Qubit EntangledWState

Manfred Eibl, Nikolai Kiesel, Mohamed Bourennane, Christian Kurtsiefer, Harald Weinfurter
2004 Physical Review Letters  
We report on the experimental observation of the three-photon polarization-entangled W state using spontaneous parametric down-conversion. This state is inequivalent to the Greenberger-Horne-Zeilinger state under stochastic local operations and classical communications and thus is the representative of the second class of genuine tripartite entanglement. We study the characteristic features of entanglement and demonstrate the high degree of two-photon entanglement in the W state.
doi:10.1103/physrevlett.92.077901 pmid:14995887 fatcat:go7hc6ysuvglthzel7xgdaqsqm