I have this quantum circuit:

and from the IBM quantum composer I get this state amplitudes:

I wanted to flip the target qubit and keep only its pure state however this is not what I am getting.I am also getting the control qubit to be in state $|1>$ which I dont think is correct since the measurement gate doesnt do that.Is this a bug on the IBM quantum composer or is it due to how it treats a quantum circuit?

  • $\begingroup$ What do you mean by measurement gate? $\endgroup$
    – FDGod
    Commented Dec 17, 2023 at 9:25
  • $\begingroup$ The irreversible gate of measurement. $\endgroup$ Commented Dec 17, 2023 at 14:47

1 Answer 1


Its a bug.Thats why you never simulate qubits on a classical computer.It translates the measurement gate into 1 or at least it shows only the 1:

It is 100% pure state so it is correct.


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