Fig. 2

Collapses and revivals in the non-linear spin dynamics. a Evolution of the spin projection probabilities Π_m along z as a function of the light pulse area ωt. b, c Evolution of the magnetization m_z and of the variance in the spin projection \({\mathrm{\Delta }}J_z^2\) calculated from the Π_m distributions. The dashed red lines represent the ideal evolution for a \(\hat J_x^2\) coupling⁴³, and the blue solid lines correspond to a fit taking into account experimental imperfections (see Methods). Each point is the average of five measurements, and the error bars represent the 1σ statistical uncertainty