Torrontegui Muñoz, ErikChen, XiModugno, MichelleRuschhaupt, AndreasGuéry-Odelin, DavidMuga, Juan Gonzalo2021-03-182021-03-182012-03Torrontegui, E., Chen, X., Modugno, M., Ruschhaupt, A., Guéry-Odelin, D., Muga, J. G. (2012). Fast transitionless expansion of cold atoms in optical Gaussian-beam traps. Physical Review A, 85(3).1050-2947https://hdl.handle.net/10016/32178We 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.9eng©2012 American Physical Societyresearch articleFísicahttp://dx.doi.org/10.1103/PhysRevA.85.033605open access033605-13033605-9Physical Review A85AR/0000026567