Very interesting. I'm still of the belief that Quantum computers don't exist. Google might claim they have one however I believe in Nikola Tesla who was not a fan of atomic theory and side with his theories instead. He thought the belief in atomic theory was a "psychosis". I'm not throwing out double slit entirely mind you or some of the circumstantial data. But it seems like theoretical mumbo jumbo science has become the new religion. I'm not saying extremely fast computers similar to speeds boasted by Quantum computing won't happen either. They most likely will. However I don't think the key to breaking BTC will be in brute force computing, it will be in breakthroughs in math and logic.
There are other alternative explanations for double slit than a particle/wavicle/wave... people make too many assumptions based on that data and don't consider many studies have alterior motives
Quantum computers exist just like interstellar travel exists, in the minds of dreamers and researchers. Neither will happen in our lifetime.
Even if we can spin one atom to the left and one to the right, that's as far from a practical, working computer like device as the Earth is from the nearest star. I don't know about you but, I know pretty much for sure I wont be vacationing on Alpha Centauri...