Landau-Zener-Stückelberg interferometry: Constructive interference

The intensity red circle represents the occupation probability of the state "up", and the intensity green circle represents the occupation probability of the state "down". The solid black lines are the instantaneous energy eigenvalues, and the red and the green dashed lines are the average, or diabatic, energies of the states "up" and "down". The blue dashed line corresponds to the bias point, including the driving signal. In the case of fully constructive interference, the mixing between the two states at consecutive adds up and results in full oscillations between states "up" and "down".