title: Sub-Fourier characteristics of a δ-kicked-rotor resonance.
abstract: We experimentally investigate the sub-Fourier behavior of a δ-kicked-rotor resonance by performing a measurement of the fidelity or overlap of a Bose-Einstein condensate exposed to a periodically pulsed standing wave. The temporal width of the fidelity resonance peak centered at the Talbot time and zero initial momentum exhibits an inverse cube pulse number (1/N3)-dependent scaling compared to a 1/N2 dependence for the mean energy width at the same resonance. A theoretical analysis shows that for an accelerating potential the width of the resonance in acceleration space depends on 1/N3, a property which we also verify experimentally. Such a sub-Fourier effect could be useful for high precision gravity measurements.
authors.affiliation: Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078-3072, USA.
authors.forename: I
authors.initials: I
authors.lastname: Talukdar
authors.forename: R
authors.initials: R
authors.lastname: Shrestha
authors.forename: G S
authors.initials: GS
authors.lastname: Summy