A "quantum bit," used in quantum computing, that is both zero and one at the same time, until quantum decoherence (direct or indirect observation by a conscious observer) causes each quantum bit to disambiguate into a state of zero or one. One qu-bit stores two possible numbers (zero and one) at the same time. N qu-bits stores 2N possible numbers at the same time. Thus an N qu-bit quantum computer would try 2N possible solutions to a problem simultaneously, which gives the quantum computer its enormous potential power.

Articles on KurzweilAI.net that refer to Qu-Bit

The Age of Spiritual Machines: Glossary By Ray Kurzweil
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Centre for Quantum Computation
The Centre for Quantum Computation, part of the University of Oxford, conducts theoretical and experimental research into all aspects of quantum information processing, and into the implications of the quantum theory of computation for physics itself.