In theory, the hundreds of photons, controlled by the triggering photon, could fan out and switch off hundreds of other transistors in an optical circuit.

The main thing is that the University of Erlangen-Nuremberg has now provided "the missing switch" that graphene transistors so desperately needed.

Bose-Einstein condensate – a super-cold gas cloud of atoms – could construct atomic transistors with more complex capabilities than electronics ...

It can do AND or OR logic in a single transistor, switch states using light.