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Quantum walks of correlated photon pairs in two-dimensional waveguide arrays

: Poulios, K.; Keil, R.; Fry, D.; Meinecke, J.D.A.; Matthews, J.C.F.; Politi, A.; Lobino, M.; Gräfe, M.; Heinrich, M.; Nolte, Stefan; Szameit, A.; O'Brien, J.L.


Physical review letters 112 (2014), Nr.14, Art. 143604
ISSN: 0031-9007
ISSN: 1079-7114
Fraunhofer IOF ()
correlated photon pairs; correlated photons; non-planar structures; nonclassical behavior; quantum interference; strong correlation; two-dimensional networks; two-dimensional waveguides

We demonstrate quantum walks of correlated photons in a two-dimensional network of directly laser written waveguides coupled in a "swiss cross" arrangement. The correlated detection events show high-visibility quantum interference and unique composite behavior: strong correlation and independence of the quantum walkers, between and within the planes of the cross. Violations of a classically defined inequality, for photons injected in the same plane and in orthogonal planes, reveal nonclassical behavior in a nonplanar structure.