Fast transitionless expansions of cold atoms in optical Gaussian beam traps

Details Fast transitionless expansions of cold atoms in optical Gaussian beam traps Fast transitionless expansions of cold atoms in optical Gaussian beam traps

2011-10-31

arxiv.org/abs/1111.0035v1

Physics

Quantum Physics

Scientific paper

We study fast expansions of cold atoms in a three-dimensional Gaussian-beam optical trap. Three different methods to avoid final motional excitation are compared: inverse engineering using Lewis-Riesenfeld invariants, which provides the best overall performance, a bang-bang approach, and a fast adiabatic approach. We analyze the excitation effect of anharmonic terms, radial-longitudinal coupling, and radial-frequency mismatch. In the inverse engineering approach these perturbations can be suppressed or mitigated by increasing the laser beam waist.

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