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Quantum Fourier Transform (QFT) is a linear transformation on quantum bits and is the quantum analogue of the discrete Fourier transform. The quantum Fourier transform is a part of many quantum algorithms, notably Shor's algorithm for factoring and computing the discrete logarithm, the quantum phase estimation algorithm for estimating the eigenvalues of a unitary operator, and algorithms for the hidden subgroup problem. (Wikipedia)

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Why a Fourier Adder Gives Multiple Faulty Results?

I followed this tutorial and wrote a code that implements the following circuit: By writing the following code: from qiskit import QuantumCircuit, Aer, QuantumRegister, ClassicalRegister import qiski …
Himanshu Bansal's user avatar