New photonic computing method uses electromagnetic waves to solve partial differential equations rapidly. See our recent paper on this topic: https://spie.org/news/photonic-computing-harnesses-electromagnetic-waves which follows the approach initiated in the paper I reported in 2023 in https://blogs.ncl.ac.uk/alexyakovlev/2023/10/15/paper-on-time-derivatives-computation-in-waveguides/