The formula for the QFT is given by:

`QFT| x ⟩ = 1/√(2^n) Σ_y=0^(2^n-1) exp(2πi x y / 2^n) | y ⟩`

where `Σ` is the summation operator, and `i` is the imaginary unit. This formula shows that the QFT is a linear transformation that maps the basis state `|x⟩` to a superposition of all possible basis states `|y⟩`, each with a complex phase determined by `x` and `y`.
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