Experimental realization of a three-qubit entangled W state.
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.
Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
Manfred
M
Eibl
Nikolai
N
Kiesel
Mohamed
M
Bourennane
Christian
C
Kurtsiefer
Harald
H
Weinfurter