Calendar of Physics Talks Vienna

Classical Holographic Codes
Speaker:Enrice Brehm (LMU München)
Abstract:im Rahmen des Seminars für Mathematische Physik: I present toy models for the AdS/CFT correspondence that model essential features such as the Ryu-Takayanagi formula and bulk reconstruction properties. Recently Quantum Error Correcting Codes (QECC) were shown to fall into this class, mainly because of their very special entanglement structure. I want to present some models that are motivated by QECC and share the same features but without quantum correlations, as e.g. entanglement. We call them classical holographic codes. They can be understood as concatenated probabilistic codes and can be represented as networks uniformly covering hyperbolic space.
Date: Tue, 25.10.2016
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:S. Fredenhagen, H. Steinacker

Massive and supermassive neutrinos as dark matter
Speaker:Patrick Ludl (Univ. of Southampton, U.K.)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Tue, 25.10.2016
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, H. Neufeld

Testing the quantum and gravity interface with single photons
Speaker:Christopher Hilweg (Vienna)
Abstract:Quantum theory and general relativity are considered the two pillars of modern physics. Their predictions are verified with spectacular precision on scales covering several orders of magnitude. Despite their success in describing nature, a unique framework reconciling these two theories is still missing. In this talk we will present a modified version of a Mach-Zehnder interferometer, capable of realizing the first table-top experiments probing jointly the quantum superposition principle and the mass-energy equivalence principle for single photons. The novel gravitational effects to be tested in this project arise when a single photon is travelling in a superposition along two paths located at different heights above earth and which are then brought to interfere. Due to the Shapiro delay, the travel time of a photon depends on the altitude of its path above earth. For the time . . . .
Date: Thu, 27.10.2016
Time: 14:00
Duration: 60 min
Location:Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien
Contact:P.T. Chrusciel

Speaker:Univ.Prof. Dr. Thomas A. Klar (Institute of Applied Physics Johannes Kepler University Linz Linz, Austria)
Abstract:In 1873, Ernst Abbe pointed out that optics below the dimensions of the wavelength of light is pretty cumbersome, specifically that resolution should be limited by diffraction. This claim kept its dogmatic character for one century until Stefan Hell put forward the idea to break this limit in fluorescence microscopy using stimulated emission depletion (STED). We are now using STED in lithography and we construct sub-­‐diffraction patterns, including bio-­‐inert scaffolds that carry, in three dimensional space, bio-­‐functional nanoanchors which allow for targeted placement of proteins or oligonucleotides. Another approach to nanoscale optics is plasmonics. Multi-­‐layered gold/silver/oxide nanostars are one example which we use for the improvement of organic LEDs or random lasers. Voltage-­‐clamped gold nanoparticles also allow for an optical read-­‐out of chemical processes at their sol
Date: Thu, 27.10.2016
Time: 16:00
Location:TU Wien Freihaus Hörsaal 2 Wiedner Hauptstr. 8-­‐10, 2nd floor
Contact:Univ.Prof.Dr. Friedrich Aumayr