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Approaching classicality in quantum accelerator modes through decoherence.

M B d'Arcy1, R M Godun, M K Oberthaler

  • 1Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 12, 2001
PubMed
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We studied a "delta-kicked accelerator" using laser-cooled atoms. Gravity creates quantum accelerator modes, increasing energy faster than classical analogs, unlike the standard delta-kicked rotor system.

Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Dynamics
  • Nonlinear Dynamics

Background:

  • The delta-kicked rotor is a paradigmatic model for studying quantum chaos and dynamical localization.
  • Understanding the influence of external fields, like gravity, on quantum chaotic systems is crucial.

Purpose of the Study:

  • To investigate the quantum dynamics of laser-cooled atoms in a novel
  • delta-kicked accelerator
  • system under the influence of gravity.

Main Methods:

  • Experimental measurements of mean energy in an ensemble of laser-cooled atoms.
  • Utilizing a pulsed standing wave of laser light to impart delta-kicks.
  • Comparing system behavior with and without the influence of gravity, and with classical analogs.

Related Experiment Videos

Main Results:

  • Gravity induces unique quantum phenomena, termed
  • quantum accelerator modes
  • , leading to enhanced energy growth compared to classical systems.
  • Counteracting gravity restores dynamics similar to the standard delta-kicked rotor, suppressing momentum diffusion and exhibiting dynamical localization.
  • Introduction of noise partially restores classical behaviors while preserving some quantum features.

Conclusions:

  • The delta-kicked accelerator provides a unique platform to observe novel quantum phenomena driven by gravity.
  • Quantum accelerator modes represent a significant deviation from classical dynamics and standard delta-kicked rotor behavior.
  • Noise plays a complex role, mediating between quantum and classical regimes in this system.