Phase Effect

 When does phase influence outcomes. Below, it is no surprise the single qubit

remains unaffected by a phase operation:

                                                             

Things are different with this code. The target qubit - qubit 3 - is the affected one.

                                                                                

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The crucial setting in all this is the one below: whether the QFT is inverse=True

or inverse=False. Inverse True is meant to run on a circuit that has already been

transformed ie one with hadamard gates, and control relationships. Inverse False

performs a transform on a clean set-up...