title: Observation of high-order quantum resonances in the kicked rotor.
abstract: Quantum resonances in the kicked rotor are characterized by a dramatically increased energy absorption rate, in stark contrast to the momentum localization generally observed. These resonances occur when the scaled Planck's constant Planck's [over ]=r/s 4pi, for any integers r and s. However, only the variant Planck's [over ]=r2pi resonances are easily observable. We have observed high-order quantum resonances (s>2) utilizing a sample of low energy, noncondensed atoms and a pulsed optical standing wave. Resonances are observed for variant Planck's [over ]=r/16 4pi for integers r=2-6. Quantum numerical simulations suggest that our observation of high-order resonances indicate a larger coherence length (i.e., coherence between different wells) than expected from an initially thermal atomic sample.
authors.affiliation: Centre for Quantum Information & Quantum Control, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7.
authors.forename: J F
authors.initials: JF
authors.lastname: Kanem
authors.forename: S
authors.initials: S
authors.lastname: Maneshi
authors.forename: M
authors.initials: M
authors.lastname: Partlow
authors.forename: M
authors.initials: M
authors.lastname: Spanner
authors.forename: A M
authors.initials: AM
authors.lastname: Steinberg