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Calendar of Physics Talks Vienna
| Entanglement Polytopes and Other Facets of the Quantum Marginal Problem |
| Speaker: | David Gross (University Gross) |
| Abstract: | An oft-repeated piece of wisdom says that for entangled quantum states, "the whole is greater than the sum of its parts". In other words: one expects that little information about the global state is accessible from single-particle measurements. We challenge this intuition by showing that local information alone can serve as a powerful witness to multi-particle entanglement. Each of our entanglement classes is characterized by a finite set of "Bell inequalities" on the eigenvalues of the local density operators. These inequalities cut out a constellation of convex polytopes, which geometrically encodes all locally available information about global entanglement. I will sketch possible experimental implementations, as well as the employed mathematical methods which range from classical invariant theory to asymptotic representation theory. Time permitting, I will mention related new result |
| Date: | Mon, 12.11.2012 |
| Time: | 17:30 |
| Duration: | 60 min |
| Location: | Univ. of Vienna, Ernst-Mach Hörsaal, Boltzmanngasse 5, 2nd floor, 1090 Wien |
| Contact: | Dr. Christiane Losert / Univ. of Vienna |
| The generally covariant locality principle and an extension to gauge symmetries |
| Speaker: | Jochen Zahn (Univ.Wien) |
| Abstract: | im Rahmen des Seminars für Mathematische Physik |
| Date: | Tue, 13.11.2012 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | J. Yngvason |
| Adsorption of Molecules on Cobalt Oxide Thin Films |
| Speaker: | Prof. Alexander Schneider (Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg) |
| Abstract: | Transition metal oxides are of great interest for a variety of reasons. From a Physicist's point of view, the interplay between delocalized and localized electrons gives rise to a plethora of fascinating properties, mostly connected with the magnetic properties of the materials. I will discuss complexity of the interplay between structural and magnetic respectively electronic properties of a particular example of a thin bi-layer cobalt oxide film on Ir(100). From a Chemist's point of view oxide surfaces play an important role in catalysis not only as inert supports of catalytically active agents but also as a catalyst themselves. Our understanding of the interaction of molecules with such oxide surfaces lags behind the insight that was generated on the interaction of molecules with metal surfaces. This is partially due to the fact that insulating bulk oxides are not easily accessible to |
| Date: | Tue, 13.11.2012 |
| 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. Josef Redinger |
| Geometry of Keplerian disk systems and bounds on masses of their components |
| Speaker: | Patryk Mach (Kraków) |
| Abstract: | im Rahmen des Literaturseminars |
| Date: | Wed, 14.11.2012 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock |
| Contact: | R. Beig |
| Smooth optimal control of nitrogen-vacancy centers |
| Speaker: | Björn BARTELS (Freiburger Institute for Advanced Studies, University of Freiburg) |
| Abstract: | We present pulse shaping techniques that allow us to control ensembles of NV centers with external time-dependent fields that contain only a few predefined frequency components. By doing this, we respond to experimental challenges in implementing the broad band pulses typically generated with existing optimal control algorithms like GRAPE [1]. With our approach we target the design of control pulses for the manipulation of ensembles of NV centers and the interaction of such ensembles with electro-magnetic resonators [2, 3]. We construct high fidelity pulses for ensembles with broadly distributed resonance frequencies and coupling strengths to the control field.
[1] N. Khaneja, T. Reiss, C. Kehlet, T. Schulte-Herbrüggen, S. J. Glaser, J. Magn. Reson. 172, 296 (2005).
[2] R. Amsüss et al., Phys. Rev. Lett. 107, 060502 (2011) .
[3] Kubo et al., Phys. Rev. Lett. 107, 220501 (2011).
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| Date: | Wed, 14.11.2012 |
| Time: | 16:00 |
| Location: | TU Wien, Atominstitut Essraum, Stadionallee 2, 1020 Wien |
| Contact: | Johannes Majer |
| J/ψ Production in NRQCD: A Global NLO Analysis of Yield and Polarization |
| Speaker: | Mathias Butenschön (Univ. Wien) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Thu, 15.11.2012 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld |
| Influence of Fluctuating Membranes on Self-Assembly of Patchy Colloids |
| Speaker: | Richard James Matthews (Univ.Wien) |
| Abstract: | im Rahmen der gemeinsam veranstalteten Seminare "Komplexe Stochastische Systeme"(Univ.Wien) und "Analyse Komplexer Stochastischer Systeme" (Med. Univ.Wien) |
| Date: | Fri, 16.11.2012 |
| Time: | 14:15 |
| Location: | Medizinische Universität Wien, Informatikbibliothek Bauteil 88, E 03, Spitalgasse 23 |
| Contact: | H. Hüffel, Stefan Thurner |
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