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. 2005 Feb 25;94(7):070402.
doi: 10.1103/PhysRevLett.94.070402. Epub 2005 Feb 24.

Full characterization of a three-photon Greenberger-Horne-Zeilinger state using quantum state tomography

K J Resch  1 , P Walther, A Zeilinger
Affiliations

Full characterization of a three-photon Greenberger-Horne-Zeilinger state using quantum state tomography

K J Resch et al. Phys Rev Lett. .

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.

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