Spatio-spectral quantum networks in nonlinear photonic lattices
Natalia Costas, Nadia Belabas, David Barral · Physical Review Research · 2025
Multiplexing information in different degrees of freedom is a natural solution to the scalability bottleneck in optical quantum communications and computing. However, for bulk-optics systems, size, cost, stability, and reliability can make scalability either impractical or highly challenging to implement. We present a framework to engineer continuous and discrete-variable entanglement produced through nondegenerate spontaneous parametric down-conversion in χ ( 2 ) nonlinear photonic lattices in spatial and spectral degrees of freedom that can alleviate the scalability challenge. We show how spatio-spectral pump shaping produces cluster states that are natively distributable in quantum communication networks and a resource for measurement-based quantum computing.