Experimental Observation of an Entire Family of Four-Photon Entangled States
Witlef Wieczorek, Christian Schmid, Nikolai Kiesel, Reinhold Pohlner, Otfried Gühne, Harald Weinfurter · Physical Review Letters · 2008
A single linear-optical setup is used to observe an entire family of four-photon entangled states. This approach breaks with the inflexibility of present linear-optical setups usually designed for the observation of a particular multipartite entangled state only. The family includes several prominent entangled states that are known to be highly relevant for quantum information applications.