= Photonic GHZ preparation by fourfold coincidence
A <postselection> scheme in which two <polarization-entangled photon pairs> pass through <polarizing beam splitters>, a <half-wave plate> and a nonpolarizing <beam splitter>. One photon at each of a trigger and three output detectors selects a <GHZ state> in the three output polarizations, provided <optical mode matching> removes distinguishable pair labels. All four detections are needed for the selected event; the trigger alone does not guarantee the three other output occupations.
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