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The quantum Fourier transform (QFT) function is the quantum analog for discrete Fourier transform. It is applied on the quantum register state vector. The state vector x is transformed to y in the following manner: yk=1N∑j=0N−1xje2πijkNy_{k} = \frac{1}{\sqrt{N}} \sum_{j=0}^{N-1} x_j e^{2\pi i \frac{jk}{N}} Function: qft Arguments:
  • target: QArray[QBit]
The target quantum argument is the quantum state on which we apply the QFT.

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Example

from classiq import *


@qfunc
def main(x: Output[QArray[QBit]]):
    allocate(4, x)
    qft(x)


qmod = create_model(main)


qprog = synthesize(qmod)