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Wavevector quasi-phase matching was devised in the 1960s as a way to boostnonlinear interactions with efficient quantum noise squeezing as oneoutstanding outcome. In the era of quantum technologies, we propose a newcoupling quasi-phase matching for efficient generation of multimodedownconverted quantum light in nonlinear waveguide arrays. We highlight thistechnique achieving multimode quantum entanglement and Einstein-Podolsky-Rosensteering buildup. We discuss the feasibility of this method with currenttechnology and demonstrate its competitiveness as a resource for continuousvariables quantum information.

Coupling quasi-phase matching: entanglement buildup in $\chi^{(2)}$ nonlinear waveguide arrays