The Sciences The Next Big Thing? Using metaphor instead of mathematics, George Johnson brings clarity to the strange world of the quantum computer By Joseph F. Traub THIS ARTICLE IS ONLY AVAILABLE AS A PDF. Buy this digital issue or subscribe to access the full article. Already a subscriber or purchased this issue? Sign In Buy Digital Issue $7.99 Add To Cart Print + DigitalAll Access $99.99 Subscribe ADVERTISEMENT Scientific American is a trademark of Scientific American, Inc., used with permission © 2015 Scientific American, a Division of Nature America, Inc. All Rights Reserved.