Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Matter Wave Optics
Q 30.1: Invited Talk
Wednesday, March 13, 2019, 10:30–11:00, S SR 211 Maschb.
Atom transport at the quantum speed limit and its application for atom interferometry — Manolo Rivera1, Natalie Peter1, Thorsten Groh1, Wolfgang Alt1, Gautam Ramola1, Richard Winkelman1, Carsten Robens1, Antonio Negretti2, Simone Montangero3, Tommaso Calarco3, Dieter Meschede1, and •Andrea Alberti1 — 1Institut für Angewandte Physik, Universität Bonn — 2Zentrum für Optische Quantentechnologien, Universität Hamburg — 3Institut für komplexe Quantensysteme, Universität Ulm
I will report on the experimental realization of fast, high-fidelity transport of atomic wave packets in deep optical lattices.
The goal here is to transport atoms by one or more lattice sites in the shortest time allowed by quantum mechanics, under the constraint that no motional excitation is created after transport, and the optical lattice depth does not exceed a maximum value given by the available resources (e.g., finite laser power).
To achieve fast atom transport, we use quantum optimal control, which allows several motional excitations to be created during the transport process, and yet refocus them back into the motional ground state with a fidelity >99%. Optimizing the process for various transport times, we clearly observe a minimum time below which transport operations unavoidably create motional excitations. This time defines the quantum speed limit for the transport operation.
Extending fast atom transport to spin-dependent optical lattices, I show that we are able to enhance coherence of atom interferometers and quantum walk experiments.