Einstein-Podolsky-Rosen spatial entanglement in ordered and Anderson photonic lattices
G. Di Giuseppe, L. Martin, A. Perez-Leija, R. Keil, F. Dreisow, S. Nolte, A. Szameit, A. F. Abouraddy, D. N. Christodoulides, and B. E. A. Saleh
Accepted
We demonstrate quantum walks of a photon pair in a spatially extended Einstein-Podolsky-Rosen (EPR) 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 co-localization for pairs in an EPR entangled state. In the former case, each photon localizes independently, while in the latter neither photon localizes, but the pair co-localizes - revealing unexpected survival of the spatial correlations through strong disorder.