Optimal quantum control of Bose-Einstein condensates in magnetic microtraps: Comparison of GRAPE and Krotov optimization schemes
arXiv:1409.2976 · doi:10.1103/PhysRevA.90.033628
Abstract
We study optimal quantum control of the dynamics of trapped Bose-Einstein condensates: The targets are to split a condensate, residing initially in a single well, into a double well, without inducing excitation; and to excite a condensate from the ground to the first excited state of a single well. The condensate is described in the mean-field approximation of the Gross-Pitaevskii equation. We compare two optimization approaches in terms of their performance and ease of use, namely gradient ascent pulse engineering (GRAPE) and Krotov's method. Both approaches are derived from the variational principle but differ in the way the control is updated, additional costs are accounted for, and second order derivative information can be included. We find that GRAPE produces smoother control fields and works in a black-box manner, whereas Krotov with a suitably chosen step size parameter converges faster but can produce sharp features in the control fields.
10 pages, 9 figures; to appear in Phys. Rev. A
References in corpus (5)
- Matter-wave interferometry in a double well on an atom chip
- Random walk with barriers: Diffusion restricted by permeable membranes
- Optimal quantum control of Bose Einstein condensates in magnetic microtraps
- Atom interferometry with trapped Bose-Einstein condensates: Impact of atom-atom interactions
- Enhancing photoassociation rates by non-resonant light control of shape resonances