quantum bit

noun
  1. the fundamental unit of information in a quantum computer, capable of existing in two states, 0 or 1, simultaneously or at a different time.
Also called qu·bit [kyoo-bit] /ˈkyuˌbɪt/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for qubit

qubit

noun
  1. computing a quantum bit

Word Origin for qubit

C20: from qu (antum) + bit 4
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

qubit in Science

qubit

[kyōōbĭt′]
  1. See quantum bit.

quantum bit

  1. The smallest unit of information in a quantum computer. Unlike bits in classical systems, which are in one of two possible states labelled 1 and 0, a quantum bit exists in a superposition of these two states, settling on one or the other only when a measurement of the state is made. Also called qubit
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