Quantum computers definitely exist, as to when they will be useful is anyone's guess. Furthermore my money is on a nation state (probably US or China) being th

Quantum computers definitely exist, as to when they will be useful is anyone's guess. Furthermore my money is on a nation state (probably US or China) being the first to get a useful quantum computer. I expect that will be as classified as possible so we may not know for many years once they have one.