Graph structure simulated with a two-photon input state in the swiss cross structure
A paper has been published in the online Physical Review Letters by researches from the Centre for Quantum Photonics: Dr Konstantinos Poulios, Daniel Fry, Jasmin D. A. Meinecke, Dr Jonathan C. F. Matthews and Professor Jeremy L. O’Brien.
Quantum Walks of Correlated Photon Pairs in Two-Dimensional Waveguide Arrays
The article demonstrates 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.
Full information can be found on the Physical Review Letters web site.