A number of qubits taken together is a qubit register[?]. Quantum computers perform calculations by manipulating qubits.
It is also possible to have a threestate system, called a qutrit[?], whose states are conventionally labeled 0⟩, 1⟩ and 2⟩.
(A qubit is not to be confused with a cubit, which is an ancient measure of length equal to about 40 or 50cm.)
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