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A qubit (quantum + bit; pronounced /kyoobit/ [1] ) is a two-state quantum system which is the smallest unit of quantum information. Its two basic states are conventionally labeled |0> and |1> (pronounced: ket 0 and ket 1). A pure qubit state is a linear quantum superposition of those two states. This is significantly different from the state of a classical bit, which can only take value 0 or 1.

It is also possible to have a three-state system, called a qutrit, whose states are conventionally labeled |0>, |1> and |2>.

See also: quantum computation

(A qubit is not to be confused with a cubit, which is an ancient measure of length equal to about 40 or 50cm.)

多个量子位的组合称为量子寄存器 qubit register。量子计算机 通过操作这些量子位进行计算。

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