Suppression of decoherence effects in the quantum kicked rotor

Maxence Lepers (1) , Véronique Zehnlé (1, 2) , Jean Claude Garreau (1, 2)

1 PhLAM - Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523
2 CERLA - Centre d'Etudes et de Recherches Lasers et Applications

We describe a method allowing transient suppression of decoherence effects on the atom-optics realization of the kicked rotor. The system is prepared in an initial state with a momentum distribution concentrated in an interval much sharper than the Brillouin zone; the measure of the momentum distribution is restricted to this interval of quasimomenta: As most of the atoms undergoing decoherence processes fall outside this detection range and thus are not detected, the measured signal is effectively decoherence-free.

Mots clés: Kicked rotor; decoherence; cold atoms; quantum chaos; dynamical localization

Domaines: Physique Quantique [quant-ph]; Autre [cond-mat.other]; Dynamique Chaotique [nlin.CD]

Maxence Lepers, Véronique Zehnlé, Jean Claude Garreau. Suppression of decoherence effects in the quantum kicked rotor. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2010, 81 (6), pp.062132. ⟨10.1103/PhysRevA.81.062132⟩. ⟨hal-00473239⟩