I’m not knowledgeable on this topic. But I always dreamt of “optical” processor that does OR AND XOR functions. And I thought it was impossible. Because you can

I’m not knowledgeable on this topic. But I always dreamt of “optical” processor that does OR AND XOR functions. And I thought it was impossible. Because you can’t do this with photons. So when this article claims that optical CPU of the neuromorphic type has been reached, were photon based CPUs always real and practical?