Comment by ktallett

Oh no, that isn't factually correct. We have the theory. The theory is viable and provable and shown in both of the major branches of quantum computing, qubit and photonic. The key issue as I say is each has multiple 'architectures' for lack of a better term for each branch. We do have functional devices, it is just the function they provide is useless as we can already do it on a laptop. Which partially is a massive issue as Quantum computing almost needs to skip ahead of those development years classical computing was afforded.