Cz chevron
The Cz Chevron node sweeps the frequency and the duration of the AC flux pulse. The amplitude of the flux pulse as well as the bias DC current are at fixed values determined by the previous node (cz_parametrization)
The measurement is done with 3 state readout while the three state discriminator had already been found from the ro_ampl_three_state_optimization node.
This measurement displays the (frequency-duration) working points as yellow dots. Each dot represent a parameter pair for the flux pulse that mediates a full return to the \(\left(|11\rangle\) state. Each point is found by a sinusoidal fit on a vertical (fixed frequency) slice. Then, all the working points are fitted to a simple parabola in order to determine the chevron vertex. The working pairs are then reduced to a smaller number of points adjacent to the vertex (stars in the graph) in order to simplify the next node (cz_calibration)
{ title="the (frequency-duration) pairs that mediate a full return
to the \(\left(|11\rangle\) state" alt="cz chevron working points" }