  Quantum computing is a good way to justify difficult physics experiments. But
until quantum computers are built, do computer scientists need to know anything
about quantum information? In fact, quantum computing is not merely a recipe
for new computing devices, but a new way of looking at the world that has been
astonishingly intellectually productive. In this article, I'll talk about where
quantum computing came from, what it is, and what we can learn from it.
