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Q: Fachverband Quantenoptik und Photonik
Q 51: Poster: Quantum Optics and Photonics IV
Q 51.23: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
Fast, long-distance transport of single atoms using quantum optimal control — •Thorsten Groh1, Manolo Rivera1, Natalie Thau1, Max Werninghaus1, Carsten Robens1, Wolfgang Alt1, Dieter Meschede1, Antonio Negretti2, 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
We present a digital phase and amplitude control loop setup based on a field programmable gate array (FPGA) which enables fast transport of single cesium atoms in polarization-synthesized optical lattices over macroscopic distances. Using analog control techniques, we could demonstrate fast atom transport over single lattice sites with minimal motional excitations and transport times down to the quantum speed limit. This is achieved by modulating both position and depth of the optical lattice potential by means of quantum optimal control theory. The new FPGA-based control system allows us to implement internal model control schemes enabling feed-forward driving. This dramatically extends the bandwidth of the feedback from 1 MHz to about 10 MHz. This not only allows single-site transport of atoms in less than the oscillation period of the trapping potential, but also provides an ideal platform for long distance and multiple step transport sequences. Fast atom transport over macroscopic distances will enable high precision atom interferometry and quantum information applications.