Erlangen 2018 – scientific programme
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A: Fachverband Atomphysik
A 45: Ultracold Atoms II (joint session Q/A)
A 45.1: Talk
Friday, March 9, 2018, 10:30–10:45, K 1.022
Quantum optimal control for fast atom transport in an optical lattice — •Manolo Rivera1, Thorsten Groh1, Natalie Thau1, Carsten Robens1, Wolfgang Alt1, Dieter Meschede1, Antonio Negretti2, Tommaso Calarco3, Simone Montagero3, 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 realize fast atom transport in a polarization-synthesized state-dependent optical lattice reaching transport times down to the harmonic oscillator period of around 20µ s over one lattice site (≈0.5µ m). Atom transport at such durations reaches the quantum speed limit that we have obtained from numerical simulations of the Schrödinger equation. The transport operations are computed using optimal control theory and reach high fidelities, meaning that the atoms prepared in the ground state remain there after the transport. This is experimentally confirmed by measuring the excitation spectrum of the transported atoms by means of microwave sideband spectroscopy. The current experiment is based on an open-loop approach where the transport operations are theoretically computed. A closed-loop approach using the optimization algorithm directly in the experimental sequence allows us to further improve the fidelity of the optimal control transport operations.