Calendar of Physics Talks Vienna

Exploring Quantum Phenomena with Single Neutral Atoms
Speaker:Artur Widera (Universität Bonn)
Abstract:Neutral atom based quantum systems have seen great advances in preparation, manipulation and detection in recent years. Two complimentary approaches are pursued to study and control quantum phenomena in these systems: Experiments usually either start from single, individually controllable atoms, or they start from large many-body systems such as Bose-Einstein condensates. In the first part of my talk I will outline the progress we have made to control and exploit single neutral atoms in order to explore quantum phenomena, such as the experimental realization of a single atom interferometer; the quantum walk on a line; or the interaction of single atoms with single photons in a high-finesse optical resonator allowing us to perform a quantum non-demolition measurement of the atom’s hyperfine state, for example. In the second part of my talk I will present our approach to merge the two worlds of single atoms on the one hand and many-body systems on the other hand in order to combine their advantages. We have developed tools to immerse a single or few Cesium atoms into an ultracold Rubidium gas and study their interaction. We have observed cooling of the single atom down to the temperature of the many-body system through ground-state collisions, paving the way for, e.g., impurity physics in quantum gases.
Date: Mon, 21.03.2011
Time: 17:30
Duration: 60 min
Location:Atominstitut, großer Hörsaal, Stadionallee 2, 1020 Wien
Contact:Dr. Christiane Losert / Prof. Arno Rauschenbeutel

Genuine Multipartite Entanglement in Dicke States
Speaker:Paul Erker (University of Vienna)
Abstract:Genuine multipartite entanglement has witnessed serious attention within the scientific community recently. It was found to play a role in various fields, from solid state phase transitions to biological systems, and to be an important resource for e.g. quantum computation or quantum secret sharing. Dicke states represent an important class of multipartite quantum states, which e.g. appear as ground states of Hamiltoneans in various systems. Criteria to detect genuine multipartite entanglement in such states were recently developed and will be presented.
Date: Tue, 22.03.2011
Time: 12:30
Duration: 60 min
Location:TU Wien (Wiedner Hauptstr. 8-10, yellow area, 10th floor, seminar room E136 )
Contact:Sabine Ertl

Deformationen von Quantenfeldtheorien auf der de Sitter Raumzeit
Speaker:Eric Morfa-Morales (Univ. Wien)
Abstract:im Rahmen des Seminars für Mathematische Physik
Date: Tue, 22.03.2011
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:J. Yngvason

Decay constants of heavy mesons from QCD sum rules
Speaker:Dmitri Melikhov (Univ. Wien)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Thu, 24.03.2011
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:W. Lucha, H. Neufeld

Weakly regular spacetimes with symmetries. Definition, existence and global geometry
Speaker:Philippe LeFloch (Paris)
Abstract:im Rahmen des Literaturseminars
Date: Thu, 24.03.2011
Time: 14:15
Duration: 60 min
Location:Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock
Contact:P. T. Chrusciel

Disorder Scattering in Large-Scale Graphene Nanodevices
Speaker:Florian LIBISCH (Institut für Theoretische Physik, TU Wien)
Date: Fri, 25.03.2011
Time: 15:30
Location:TU Wien Atominstitut, Hörsaal, Stadionallee 2, 1020 Wien
Contact:H. Abele