They're not a "direct consequence". If they were, quantum computers would arise spontaneously in the environment. What you mean to say is that quantum mechanics

They're not a "direct consequence". If they were, quantum computers would arise spontaneously in the environment. What you mean to say is that quantum mechanics permits quantum computers to exist. That doesn't mean something else can't forbid them from existing, or forbid them from ever reaching supremacy in practical applications. >If you think that quantum computers won't work, then either (1) all the theorists studying them for the past half century have somehow screwed up their basic maths, or (2) our understanding of quantum mechanics is wrong in ways that experiments have already ruled out. You know this thing called science? Its goal is not to know things, it's to learn things. If we already knew everything there is to know about quantum mechanics people would have built a perfectly functioning quantum computer at the first try (or they would have known from the start it was impossible). Physicists are trying to build quantum computers partly because in doing so they learn new things about quantum mechanics, and because they want to learn if it's possible to build them. Quantum computers are themselves also an experiment about quantum mechanics.