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Quantum Fourier Transform circuit

  1. Apr 11, 2015 #1
    I'm having a very hard time understanding how the QFT can be realised using just the Hadamard and controlled rotation gates. Furthermore, I cannot see why swap gates are used to reverse the order of the qubits. I'm embarrassed that dont have much by way of any attempt to show here since I am so stumped by this but I can set up a scenario. Say we wish to perform the transformation on a 3 qubit system in the superposition state (omitting normalization factors)
    [itex]\sum\limits_{x=0}^7|{x}\rangle= |{000}\rangle+|{001}\rangle+|{010}\rangle+...+|{111\rangle}=|{1}\rangle+|{2}\rangle+...+|{7}\rangle[/itex]
  2. jcsd
  3. Apr 16, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
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