A qubit (or quantum bit) is the analog of a bit for quantum computation. Unlike an ordinary bit, which may only assume
two possible values (usually called 0 and 1), a qubit may assume a continuum of values
of the form 
where 
and 
are arbitrary complex numbers satisfying 
.
Qubit
See also
Bit, Bloch SphereThis entry contributed by David Terr
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References
Bouwmeester, D.; Ekert, A.; and Zeilinger, A. (Eds.). The Physics of Quantum Information: Quantum Cryptography, Quantum Teleportation, Quantum Computation. Berlin:Springer-Verlag, 2000.Nielsen, M. and Chuang, I. Quantum Computation and Quantum Information. Cambridge, England: Cambridge University Press, 2000.Referenced on Wolfram|Alpha
QubitCite this as:
Terr, David. "Qubit." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/Qubit.html