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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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