The big problem in photonic computing is actually making an optical transistor, i.e. a switch where the presence of photons coming from one source controls whether of photons coming from another source pass. This is harder than electrical transistors because photons are bosons and don't interact with each other, so even theoretically this is hard to imagine.
Papers that claim some progress pop up every once in a while but I haven't seen anything promising yet.
Papers that claim some progress pop up every once in a while but I haven't seen anything promising yet.