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We review recent experiments concerning multi-photon Greenberger-Horne-Zeilinger (GHZ) entanglement. We have experimentally demonstrated GHZ entanglement of up to four photons by making use of pulsed parametric downconversion. On the basis of measurements on three-photon entanglement, we have realized the first experimental test of quantum non-locality following from the GHZ argument. Not only does multi-particle entanglement enable various fundamental tests of quantum mechanics versus localdoi:10.1007/978-3-662-05032-3_16 fatcat:qzfex32q3fh5diayozt7n4oara