Frankfurt 2006 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
Q: Quantenoptik und Photonik
Q 21: Ultrakalte Moleküle
Q 21.2: Vortrag
Dienstag, 14. März 2006, 10:55–11:10, HII
Prospects for Quantum Control of Ultracold Photoassociation — •Ulrich Poschinger1, Wenzel Salzmann1, Roland Wester1, Matthias Weidemüller1, Christiane Koch2, and Ronnie Kosloff2 — 1Physikalisches Institut, Universität Freiburg — 2Fritz Haber Center for Molecular Dynamics Research, Hebrew University Jerusalem
We present a theoretical investigation concerning the pulsed photoassociation of ultracold molecules [1]. In this process, a colliding ultracold atom pair is excited by a tailored short laser pulse. The resulting coherent superposition of bound vibrational levels is de-excited after a time delay into bound ground-state levels. An analytical model for the photoassociation rate for weak excitation pulses is developed and compared to the simulations. By means of this model, numerically optimized pulses are obtained. These pulses can be used in future closed-loop quantum control experiments as an initial guess. In contrast to previous investigations concentrating on chirped pulses, we direcly model a closed-loop quantum control experiment[2] employing shaped laser pulses. This work explores the role of quantum interference and thereby the extent to which quantum control techniques can be applied on the process. Experiments on the photoassociation of ultracold molecules are currently carried out in our group. [1] C. Koch et al. physics/0508090 [2] W. Salzmann et. al.,physics/0509056