# Qubit

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。

A small humanoid that jump from square to square changing its colour.