Definition of "quantum bit" []

• The smallest unit of information in a computer designed to manipulate or store information through effects predicted by quantum physics. Unlike bits in classical systems, a quantum bit has more than two possible states: a state labeled 0, a state labeled 1, and a combination of the two states that obeys the superposition principle. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.