Rostock 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 12: Ultra-cold atoms, ions and BEC
A 12.25: Poster
Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik
Fast transport of single atoms in optical lattices using quantum optimal control — •Manolo Rivera1, Natalie Peter1, Thorsten Groh1, Carsten Robens1, Wolfgang Alt1, Antonio Negretti2, Tommaso Calarco3, Simone Montagero3, Dieter Meschede1, and Andrea Alberti1 — 1Institut für Angewandte Physik, Universität Bonn, Wegelerstraße 8, D-53115 Bonn, Germany — 2Zentrum für Optische Quantentechnologien, Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany — 3Institut für komplexe Quantensysteme, Universität Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany
We report on fast, high-fidelity transport of single atoms in spin-dependent optical lattices. To transport atoms spin dependently, we use a high-precision polarization synthesizer, which allows us to displace the lattice potentials with angstrom precision with MHz bandwidth. The transport sequences computed from quantum optimal control theory are believed to reach the fundamental speed limit of our optical lattice system, corresponding to one lattice site displacement in 30µ s. During transport operations close to the quantum speed limit, the atoms are excited by several motional quanta, but are refocused back to the ground state at the end of the transport. This is confirmed by measuring after transport the fraction of atoms in the ground state using a novel detection scheme based on microwave sideband spectroscopy. Finally, we demonstrate applications of fast atom transport in atom interferometry and quantum walks.