Einstein-Podolsky-Rosen Spatial Entanglement in Ordered and Anderson Photonic Lattices
Giovanni Di Giuseppe, Lane Martin, Armando Pérez-Leija, Robert Keil, Felix Dreisow, Stefan Nolte, Alexander Szameit, Ayman F. Abouraddy, Demetrios N. Christodoulides, Bahaa E. A. Saleh · Physical Review Letters · 2013
We demonstrate quantum walks of a photon pair in a spatially extended Einstein-Podolsky-Rosen state coupled into an on-chip multiport photonic lattice. By varying the degree of entanglement we observe Anderson localization for pairs in a separable state and Anderson colocalization for pairs in an Einstein-Podolsky-Rosen entangled state. In the former case, each photon localizes independently, while in the latter neither photon localizes, but the pair colocalizes--revealing unexpected survival of the spatial correlations through strong disorder.