Hannover 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MO: Fachverband Molekülphysik
MO 24: Poster: Quantum Control
MO 24.2: Poster
Donnerstag, 11. März 2010, 16:00–18:30, Lichthof
Open-loop and closed-loop quantum control in von Neumann time-frequency phase space — •Stefan Ruetzel1, Christoph Stolzenberger1, Frank Dimler1, Susanne Fechner1, David J. Tannor2, and Tobias Brixner1 — 1Institut für Physikalische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Department of Chemical Physics, Weizmann Institute of Science, 76190 Rehovot, Israel
The parameterization of shaped laser pulses plays a decisive role in the outcome of quantum control experiments. Depending on the system under investigation and the control target, the experimentalist has to choose an appropriate parameterization to reveal possible control mechanisms.
We have introduced the von Neumann representation, a joint time-frequency description of shaped femtosecond laser pulses and have proposed a large variety of applications. Here we present time-frequency phase-space scanning procedures of shaped femtosecond laser pulses in the von Neumann formalism that can be applied to measure multidimensional molecular control landscapes. This technique has been utilized to analyze the intrapulse pump-dump mechanism of a laser dye in solution.
On the other hand, the von Neumann basis can be implemented into an evolutionary algorithm for closed-loop quantum control experiments. We show simulated as well as experimental results that prove the advantage of this laser pulse basis over conventional parameterizations.