Control of an atom laser using feedback

Details Control of an atom laser using feedback Control of an atom laser using feedback

2003-10-07

arxiv.org/abs/cond-mat/0310130v1

Physics

Condensed Matter

6 pages, 7 figures

Scientific paper

10.1103/PhysRevA.69.013605

A generalised method of using feedback to control Bose-Einstein condensates is introduced. The condensates are modelled by the Gross-Pitaevskii equation, so only semiclassical fluctations can be suppressed, and back-action from the measurement is ignored. We show that for any available control, a feedback scheme can be found to reduce the energy while the appropriate moment is still dynamic. We demonstrate these schemes by considering a condensate trapped in a harmonic potential that can be modulated in strength and position. The formalism of our feedback scheme also allows the inclusion of certain types of non-linear controls. If the non-linear interaction between the atoms can be controlled via a Feshbach resonance, we show that the feedback process can operate with a much higher efficiency.

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