Realizing the quantum computer is THE scientific challenge of our time. Like previous grand scientific challenges, such as, for example, the human genome project or the direct detection of gravitational waves, quantum computing represents a radical advance in our ability to probe and understand nature. And yet the impact of quantum computing stands out as even greater than other recent grand challenges. We observe that the classical computer now stands as the most powerful scientific tool; for example, it underpins genomics, the detection and interpretation of gravity wave signals, and...