Calendar of Physics Talks Vienna

Towards a Quantum Internet
Speaker:Prof. Gerhard Rempe (Max Planck Institute of Quantum Optics, Garching, Germany)
Abstract:Quantum networks are the backbone of distributed quantum computing architectures and quantum communication. Single atoms in optical cavities constitute universal quantum network nodes capable of sending, receiving, storing, and releasing photonic quantum information. An elementary version of a quantum network based on two identical nodes in independent laboratories is presented. The transfer of quantum information and the creation of remote entanglement are achieved by the exchange of a single photon. This approach to quantum networking offers a clear perspective for scalability.
Date: Mon, 09.01.2012
Time: 17:30
Duration: 60 min
Location:Univ. Wien, Ernst-Mach-Hörsaal, Boltzmanngasse 5, 2nd floor
Contact:Dr. Christiane Losert / Univ. of Vienna

Stochastic Oscillations of General Relativistic Disks
Speaker:Gabriela Mocanu (Babes-Bolyai University, Romania)
Abstract:The general relativistic oscillations of a thin accretion disk around compact astrophysical objects are analyzed. These objects interact with the surrounding medium through non-gravitational forces, modeled via a friction force and a random force respectively. The dynamics of the stochastically perturbed disk can be formulated in terms of a general relativistic Langevin equation. The vertical oscillations of the disks in the Schwarzschild and Kerr geometries are considered in detail, and they are analyzed by numerically integrating the corresponding Langevin equations. The importance of this analysis in the context of explaining the nontrivial power spectral distribution slopes for Active Galactic Nuclei is discussed.
Date: Tue, 10.01.2012
Time: 12:30
Duration: 60 min
Location:TU Wien (Wiedner Hauptstrasse 8-10/136, 1040 Wien, yellow area, 10th floor, seminar room 136)
Contact:Sabine Ertl

Resource Optimization and Scheduling of Generation in Electricity Energy Markets
Speaker:Dr. Gerhard Lakits (Energy Management Applications / Siemens AG Austria)
Abstract:Whereas everyone is talking about smart grids, bulk generation remains the main source of electricity for the next decades. It is subject to new challenges due to the increasing impact of renewable generation (wind power, solar power,..) and uncertainties in fuel prices and supply. The providers of bulk generation are offering to the electricity market and using mathematical optimization to improve their position on the markets. The author will give a short overview on todays energy markets and present a state-of-the-art tool set for optimization.
Date: Tue, 10.01.2012
Time: 16:00
Location:Technische Universität Wien, Institut für Angewandte Physik, Seminarraum 134A, Turm B (gelbe Leitfarbe), 5. OG, 1040 Wien, Wiedner Hauptstraße 8-10
Contact:Ao.Univ.Prof. Dr. Friedrich Aumayr

GHz/THz/FIR Conductivity in the Ferropnictides
Speaker:Ewald Schachinger (TU Graz)
Abstract:The Fermi surface and typical experimental results for the GHz/THz/FIR conductivity in the ferropnictides BaFe2As2 and Fe(SeTe) are discussed. Based on these Fermi surfaces a (minimum) Two-Band BCS model is proposed which can be used to describe the s+- symmetry of the superconducting gap. The properties of this model in the GHz/THz/FIR frequency region are discussed in general before the model is applied to the analysis of experimental results which have been presented at the beginning of this talk. Caveats of the Two-Band BCS model are also discussed here. Finally, necessary extensions beyond this rather simple and intuitive BCS model necessary for a better and more consistent data analysis are noted as a future project.
Date: Wed, 11.01.2012
Time: 16:00
Duration: 60 min
Location:Freihaus Seminarraum 138B, Turm C, 7. OG (rote Leitfarbe)
Contact:Andrei Pimenov

Aktueller Stand des Projektes MedAustron mit dem Schwerpunkt nichtklinische Forschung
Speaker:Dr. rer. nat. Ingeborg Zeh (PEG MedAustron GmbH)
Abstract:Ausgestattet mit modernster Technik und Infrastruktur, wird MedAustron, das Zentrum für Ionentherapie und Forschung, in den Bereichen Experimentalphysik, Medizinische Strahlenphysik und Strahlenbiologie ein interessantes Forschungsumfeld bieten. Ab Mitte 2015 werden Wissenschafter die Möglichkeit haben, den Ionenstrahl für ihre Experimente in vielfacher Art und Weise zu nutzen. Im Vortrag werden die Rahmenbedingungen aufgezeigt, die die Forscher erwarten und über die Forschungs- und Kooperationsmöglichkeiten informiert, die MedAustron Research bieten wird.
Date: Wed, 11.01.2012
Time: 17:00
Duration: 60 min
Location:Stefan Meyer Institute for subatomic physics, Boltzmanngasse 3, 1090, Raum 2.08
Contact:Fiona Boes, 01 4277 29701

Drell-Yan production at small transverse momentum and the collinear anomaly
Speaker:Thomas Becher (Univ. Bern)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Thu, 12.01.2012
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:H. Neufeld

Conformally invariant overdetermined PDEs and Einstein metrics
Speaker:Andreas Cap (Vienna)
Abstract:im Rahmen des Literaturseminars
Date: Thu, 12.01.2012
Time: 14:15
Duration: 60 min
Location:Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock
Contact:R. Beig

Dissipative motion with non-constant friction: from phenomenological models to generalized Langevin equations
Speaker:Maximilian Sadilek (Univ. Wien)
Abstract:im Rahmen der gemeinsam veranstalteten Seminare "Komplexe Stochastische Systeme" (Univ.Wien) und "Analyse Komplexer Systeme" (Med.Univ.Wien)
Date: Fri, 13.01.2012
Time: 14:15
Duration: 90 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien
Contact:H. Hüffel, Stefan Thurner

Multipath and polarization entanglement of photons
Speaker:Paolo Mataloni (Quantum Optics Group, Department of Physics, Sapienza Università di Roma)
Abstract:In recent years many theoretical and experimental works have demonstrated the importance of multiqubit photon states to operate in a high-dimensional Hilbert space. By entangling different degrees of freedom (DOFs) of a single particle or two or more particles using their DOFs fundamental test of quantum mechanics and innovative quantum information protocols have been realized. I will present some of the most relevant results obtained by us with hyperentangled 2-photon states. I will also show the possibilities offered by the “integrated quantum circuits” to overcome the structural limits of conventional bulk optics in view of an efficient implementation of multiqubit entangled photon states of increasing complexity.
Date: Fri, 13.01.2012
Time: 15:30
Location:Hörsaal Atominstitut, Stadionallee 2, 1020 Wien
Contact:Prof. H. Rauch