QUANTUM STATES OF OPTICAL FIELDS AND THEIR USE IN QUANTUM INFORMATICS Polarization-Momentum Hyper-Entangled Two Photon States 1
Marco Barbieri, Giuseppe Vallone, F. De Martini, Paolo Mataloni, Nazionale Interuniversitario · 2007
We present a parametric source which allows the engineering of polarization-momentum hyper- entangled two photon states based on linear optics and a single type-I nonlinear crystal. The nonlocal character of these states has been verified by various tests, including the All Versus Nothing test of local realism (A. Cabello, Phys. Rev. Lett. 87 , 010403 (2001)), which represents a generalization of the GHZ to the case of two entangled particles and two observers. We have also created a complete and deterministic Bell-state measure- ment by a novel experimental scheme which adopts polarization-momentum hyper-entanglement and requires linear optics and single photon detectors.