Fig. 2: Ramsey interferometry data.
From: Quantum back-action limits in dispersively measured Bose-Einstein condensates
a Ramsey oscillation without (black squares) and with the light pulse at \(\bar{\delta }=63.4\) and \(\bar{I}\approx 2\) (red circles) and \(\bar{I}\approx 7\) (blue triangles), taken in situ as the phase jump δϕP between the two pulses is varied. Solid curves are fits to the equation given in the text. Blue Ramsey data δϕP values are deliberately shifted by 2π to visualize the reduction in contrast and the larger phase shift. b Optically induced phase shift ϕ as a function \(\bar{I}\) at \(\bar{\delta }=63.4\) (red circles) and \(\bar{\delta }=116.2\) (green squares). The same-color lines are fits to \(-V_{\rm ac} t_{\rm m} / \hbar\ {\rm mod}\ 2\pi\). Shaded regions indicate the ±1σ statistical uncertainty range.
