Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Quanteneffekte
Q 30.2: Talk
Tuesday, March 13, 2012, 14:15–14:30, V7.03
Landau-Zener Tunneling in the Presence of Dephasing — •Felix Lucas1,2 and Klaus Hornberger2 — 1Max-Planck-Institut für Physik Komplexer Systeme Dresden — 2Institut für Physik, Universität Duiburg-Essen
We study transitions at an avoided level crossing for systems subject to decoherence as described by a Lindblad master equation. This constitutes the simplest possible extension of the ubiquitous Landau-Zener problem to the realm of open systems. The time evolution is expanded in terms of quantum jumps, of which the most relevant ones are used to construct an effective description covering the whole range from the adiabatic to the nonadiabatic regime. This method provides an excellent approximation of the numerically exact transition probabilities. As an application, we discuss the possibility of incoherent control of molecular dynamics by non-selective measurements.