Fig. 2
From: Ramsey interferometry with trapped motional quantum states
Signal for a Ramsey-interferometer between the S- and D-bands for V0 = 10Er. a The oscillation of the population of atoms in the D-band pD (initial temperature T = 50 nK). The dots with error-bars are the mean of three measurements, while single measurement is shown as red circle, and the red solid line is the corresponding fitting curve to the mean value. The images below show typical time of flight pictures after band mapping, the TOF images P1 is taken at 0 μs and P2 at 20 μs, the images P3 and P4 around 1.5 ms. b Detail of the oscillation for tOL < 100 μs (shown as black dots). c The decay of the interferometer contrast C(tOL) for different temperatures. The black dots, red squares and green diamonds corresponding to 50 nK, 110 nK and 180 nK, respectively, with the corresponding solid lines a guide to eye. Error-bars show the 95% confidence bounds of fitting result of the oscillation amplitude. The horizontal dashed line indicates the contrast drops to the value of 1/e that gives the coherence time τ
