Extended Data Fig. 1: Calibration of spin rotation around the \({\hat{Q}}_{0}\) axis.
From: Quantum-enhanced sensing by echoing spin-nematic squeezing in atomic Bose–Einstein condensate
Spin rotations are realized by adjusting the relative phase between two consecutive MW π pulses, which are resonantly coupled to the clock transition between \(\left\vert 1,0\right\rangle\) and \(\left\vert 2,0\right\rangle\) hyperfine states. The blue dots are experimental results averaged over 10 repetitions and the uncertainty of one standard deviation is smaller than the dot size. The solid line is a fit using trigonometry function which helps to infer the actually accumulated geometric phase from the MW pulses.
