          ┌───┐┌─┐
q_0: ──■──┤ X ├┤M├
     ┌─┴─┐└┬─┬┘└╥┘
q_1: ┤ X ├─┤M├──╫─
     └───┘ └╥┘  ║ 
c: 2/═══════╩═══╩═
            1   0 