Averaged time traces of the measured heterodyne signal powers corresponding to the readout schemes shown in a postselected on successful measurements of the prepared qubit state (g g and e e) based on 15,000 independent trials. Grey lines show theoretical predictions which are expected to deviate for |e> before the steady state is reached (see text and Supplementary Information ). The shaded areas highlight the difference between both qubit-state responses, for the interval where we extract the weighting functions f = Ie - Ig for the temporal in-phase quadrature integration.
