Fig. 3: Suppressing laser intensity noise using error-robust Bragg pulses.
From: Enhancing the sensitivity of atom-interferometric inertial sensors using robust control
Experimental fringes for T = 5 ms order-3 Bragg interferometers implemented using (a) conventional Gaussian pulses with a standard deviation στ of 25 μs and (b) our error-robust pulses. The lowest, noise-free curves show actual measured population; additional fringes are offset vertically with a spacing of 20% for increasing values of applied noise σβ (labels in-set). The background color gradient is indicative of the level of applied noise. Fringes were recorded with the interferometer running in this configuration for a range of σβ = 0, 0.05, 0.1, 0.15, 0.2, with σβ = 0 representing no applied noise. Solid lines are sinusoidal fits to each set of data with fixed periodicity. c shows the phases and uncertainties obtained from sinusoidal fits to the fringes in a and b, where error bars correspond to ± 1 standard error in the phase obtained from each sinusoidal fit. The vertical dotted line corresponds to the expected phase of zero radians.
