Hamburg 2009 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Poster I
A 15.54: Poster
Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster
Excitation of Rydberg atoms in an ultracold gas by a rotary echo sequence — •Sebastian Wüster1, Cenap Ates1, Thomas Pohl1, Piotr Deuar2, Joel Corney3, and Jan-Michael Rost1 — 1Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — 2Université Paris-Sud, CNRS, Orsay cedex, France — 3ARC Centre of Excellence for Quantum-Atom Optics, School of Physical Sciences, University of Queensland, Brisbane, Australia
We model the excitation and subsequent de-excitation of Rydberg states in a Bose-Einstein condensate. Our method, stochastic Gauge-P quantum many-body theory, can in principle provide the complete quantum field dynamics of a many-mode, many-particle problem for a softened long-range interaction potential. Typically intractably large Hilbert-space sizes are tackled by representing quantum correlations numerically through noise correlations. As a trade-off, the amplification of this noise intrinsically limits the possible simulation times.
The aim is to study spatial correlations among the remnant fraction of Rydberg atoms, following an echo sequence. This sequence consists of an excitation pulse, followed by a de-excitation pulse of equal duration that would return all atoms to the ground state if there were no interactions. The long-range dipolar interactions between Rydberg states cause dephasing, resulting in a remnant Rydberg population after the sequence.