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Phys Rev Lett. 2007 May 4;98(18):180502. Epub 2007 May 4.

Realization and characterization of a two-photon four-qubit linear cluster state.

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  • 1Dipartimento di Fisica dell'Universit√° La Sapienza and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Roma, 00185 Italy.

Abstract

We report on the experimental realization of a four-qubit linear cluster state via two photons entangled both in polarization and linear momentum. This state was investigated by performing tomographic measurements and by evaluating an entanglement witness. By use of this state we carried out a novel nonlocality proof, the so-called "stronger two observer all-versus-nothing" test of quantum nonlocality.

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