Experimental Analysis of a Four-Qubit Photon Cluster State
Nikolai Kiesel, Christian Schmid, Ulrich Weber +4 more
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.
arXiv:quant-ph/0508128•Physical Review Letters•Nov 16, 2005•284 citations