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3

Your implementation is really close - on the website, here's the diagram that they used: So, I think you reversed the angles - it should be $-\pi/2, -\pi/4, -\pi/2$. (Also: there's a QFT inverse that Quirk has, so you can verify that the first half of your circuit is correct).


1

Quirk uses the convention that the top qubit is the least significant qubit. When Quirk shows the ket $|001\rangle$, the rightmost bit (the 1) is the top qubit line and the equivalent decimal value is 1 (instead of 4). This is the opposite of the convention in Nielsen and Chuang. Basically this means that, in Quirk, it's the top qubit that should control the ...


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