We now discuss in detail one of the most startling and yet most useful
aspects of superposition.
The most general n-qubit state would be a superposition
|ψi
n
=
2
n
−1
X
x=0
α
x
|xi
n
,
X
x
|α
x
|
2
= 1, (4.5)
where the subscript n is to emphasize that we have an n qubit state. Now it
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