title: Signatures of quantum stability in a classically chaotic system.
abstract: We experimentally and numerically investigate the quantum accelerator mode dynamics of an atom optical realization of the quantum delta-kicked accelerator, whose classical dynamics are chaotic. Using a Ramsey-type experiment, we observe interference, demonstrating that quantum accelerator modes are formed coherently. We construct a link between the behavior of the evolution's fidelity and the phase space structure of a recently proposed pseudoclassical map, and thus account for the observed interference visibilities.
authors.affiliation: Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Schlunk
authors.forename: M B
authors.initials: MB
authors.lastname: D'Arcy
authors.forename: S A
authors.initials: SA
authors.lastname: Gardiner
authors.forename: D
authors.initials: D
authors.lastname: Cassettari
authors.forename: R M
authors.initials: RM
authors.lastname: Godun
authors.forename: G S
authors.initials: GS
authors.lastname: Summy