We present a method to generate NOON states with three photons by injecting photons in an array of three waveguides. Conditional measurements project the wave function in a given (desired) state. In passing, we show how the array of three waveguides, that effectively reproduces the interaction of three fields, may be reduced to the interaction of two fields.
@article{arxiv.1904.00470,
title = {Generation of NOON states in waveguide arrays},
author = {Francisco Soto-Eguibar and Héctor M. Moya-Cessa},
journal= {arXiv preprint arXiv:1904.00470},
year = {2020}
}