The quantum computer of the future could solve in seconds calculations that would take today’s most powerful supercomputers millions of years. But how do these “impossible machines” actually work? And why are they so extraordinarily efficient? The first quantum revolution transformed our understanding of the world, forcing us to abandon a deterministic view of the universe. The second revolution—already underway—aims to build real machines: computers that follow quantum logic, an internet that is intrinsically secure, and ultra-precise sensors that will reshape our daily lives, from medicine to cybersecurity. It turns out that “God does play dice”—and with those dice, we may be creating the technologies of the future.