Abstract
We present the results of some experimental tests of quantum nonlocality performed by two-photon states, entangled both in polarization and momentum, namely hyperentangled states and two-photon four-qubit linear cluster states. These states, which double the number of available qubits with respect to the standard two-photon entangled states, are engineered by a simple experimental method, which adopts linear optics and a single type I nonlinear crystal. The tests of local realism performed with these states represent a generalization of the Greenberger, Home, and Zeilinger (GHZ) theorem to the case of two entangled particles.
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Vallone, G., Mataloni, P., De Martini, F. et al. Experiments of quantum nonlocality with polarization-momentum entangled photon pairs. Laser Phys. 17, 993–1000 (2007). https://doi.org/10.1134/S1054660X07070146
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DOI: https://doi.org/10.1134/S1054660X07070146