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Identifying Entanglement Using Quantum Ghost Interference and Imaging

2004; American Physical Society; Volume: 92; Issue: 23 Linguagem: Inglês

10.1103/physrevlett.92.233601

1092-0145

Milena D’Angelo, Yoon-Ho Kim, S. P. Kulik, Yanhua Shih,

Neural Networks and Reservoir Computing

We report a quantum interference and imaging experiment which quantitatively demonstrates that Einstein-Podolsky-Rosen (EPR) type entangled two-photon states exhibit both momentum-momentum and position-position correlations, stronger than any classical correlation. The measurements show indeed that the uncertainties in the sum of momenta and in the difference of positions of the entangled two-photon satisfy both EPR inequalities D(k1+k2)<min(D(k1),D(k2)) and D(x1-x2)<min(D(x1),D(x2)). These two inequalities, together, represent a non-classicality condition. Our measurements provide a direct way to distinguish between quantum entanglement and classical correlation in continuous variables for two-photons/two photons systems.