title: Full characterization of a three-photon Greenberger-Horne-Zeilinger state using quantum state tomography.
abstract: We have performed the first experimental tomographic reconstruction of a three-photon polarization state. Quantum state tomography is a powerful tool for fully describing the density matrix of a quantum system. We measured 64 three-photon polarization correlations and used a "maximum-likelihood" reconstruction method to reconstruct the Greenberger-Horne-Zeilinger state. The entanglement class has been characterized using an entanglement witness operator and the maximum predicted values for the Mermin inequality were extracted.
authors.affiliation: Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, 1090 Vienna, Austria.
authors.forename: K J
authors.initials: KJ
authors.lastname: Resch
authors.forename: P
authors.initials: P
authors.lastname: Walther
authors.forename: A
authors.initials: A
authors.lastname: Zeilinger