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Calendar of Physics Talks Vienna
| Coherent manipulation of sa single atomic-scale defect in amorphous oxide |
| Speaker: | Alexey Ustinov (Karlsruhe Institute of Technology (KIT)) |
| Abstract: | Spectra of electromagnetic oscillations in Josephson tunnel junctions display signatures of coherent coupling to individual microscopic defects acting as two-level systems (TLSs). These defects manifest themselves by avoided level crossings in microwave spectroscopy of the junction. TLSs are understood as atomic-scale dipoles emerging from metastable lattice configurations in amorphous dielectrics forming the tunnel barrier of the Josephson junction. I will present recent experiments in which we use a Josephson junction for manipulating the quantum state of a single TLS. We can directly measure of the energy relaxation T1 and dephasing T2 times of an individual microscopic defect in amorphous oxide. The multi-photon spectroscopy allows for direct probing of hybridized states in the combined junction-TLS coupled quantum system [1]. New method of direct microwave driving made it possible.. |
| Date: | Mon, 16.01.2012 |
| Time: | 17:30 |
| Duration: | 60 min |
| Location: | Univ. Wien, Ernst-Mach-Hörsaal, Boltzmanngasse 5, 2nd floor |
| Contact: | Dr. Christiane Losert / Univ. of Vienna |
| Probing Planck-Scale Physics with Quantum Optics |
| Speaker: | Igor Pikovski (Uni Wien) |
| Abstract: | One of the main challenges in physics today is to merge quantum theory and the theory of general relativity into a unified framework. Various approaches towards developing such a theory of quantum gravity are pursued, but the lack of experimental evidence of quantum gravitational effects thus far is a major hindrance. Yet, the quantization of space-time itself can have experimental implications: the existence of a minimal length scale is widely expected to result in a modification of the Heisenberg uncertainty relation. Here we introduce a scheme that allows an experimental test of this conjecture by probing directly the canonical commutation relation of the center of mass mode of a massive mechanical oscillator with a mass close to the Planck mass. Our protocol utilizes quantum optical control and readout of the mechanical system to probe possible deviations from the quantum commutation |
| Date: | Tue, 17.01.2012 |
| Time: | 12:30 |
| Duration: | 60 min |
| Location: | Uni Wien ( Boltzmanngasse 5, 5th floor, Schrödinger HS / large seminar room ) |
| Contact: | Sabine Ertl |
| eMET POC: A novel Electron Multi-beam Mask Exposure Tool for the Semiconductor Industry |
| Speaker: | Dr. Werner Smekal (Ion Micro Systems, Wien) |
| Abstract: | The Moore's law is valid since the 1960s for the semi-conductor industry and determines the roadmap of IC design and production. 2012 some companies already achieved the 22nm node and there is a clear plan to reach the 11nm node 2015 with the tools already available for the production process like immersion lithography (using 193nm light).
From 2016 on EUV-lithography (extreme ultraviolet) should be used to produce the next nodes, but development of this lithography process is slow and there is already doubt that this technology will be ready when it is needed. Therefore the semi-conductor industry already has alternative plans using existing tools. The mask writers based on electron beam lithography are a bottle neck though, since the smaller the pattern become on the mask, the time to write a mask becomes a serious issue. Multi-beam writing becomes therefore mandatory for future technology nodes in order to stay within reasonable realization times for leading-edge complex masks and templates. IMS Nanofabrication has developed multi-beam projection techniques implementing a programmable aperture plate system (APS) and charged-particle projection optics with 200x reduction. The technology of the eMET POC (proof of concept) tool, which is able to write 30nm-patterns with 256k beams, is presented in this talk.
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| Date: | Tue, 17.01.2012 |
| 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. Wolfgang Werner |
| Wave Maps in 2+1 Dimensions - Towards hybrid methods for puncture evolution |
| Speaker: | Michael Pürrer (Univ. Wien) |
| Abstract: | im Rahmen des Literaturseminars |
| Date: | Thu, 19.01.2012 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock |
| Contact: | R. Beig |
| Precision Flavour Physics as a Probe Beyond the Standard Model |
| Speaker: | Thomas Mannel (Univ. Siegen) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Thu, 19.01.2012 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien |
| Contact: | A. Hoang, H. Neufeld |
| Matrix models, branes and gravity |
| Speaker: | Harold Steinacker |
| Abstract: | An informal introduction to branes in Yang-Mills matrix model is given,
focusing on the IIB model. Aspects of the effective gauge theory, geometry and gravity on these branes are discussed, having in mind a brane-world scenario.
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| Date: | Thu, 19.01.2012 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | SEM 136 (Freihaus, Wiedner Hauptstrasse 8-10), Institute for Theoretical Physics, Vienna University of Technology |
| Contact: | Daniel Grumiller |
| Extensivity and Entropy: a Non-Extensive Spin-Model |
| Speaker: | Rudolf Hanel (Medizinische Univ.Wien) |
| Abstract: | im Rahmen der gemeinsam veranstalteten Seminare "Komplexe Stochastische
Systeme" (Univ.Wien) und "Analyse Komplexer Systeme (Medizinische Univ.
Wien) |
| Date: | Fri, 20.01.2012 |
| Time: | 14:15 |
| Duration: | 90 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien |
| Contact: | H. Hüffel, Stefan Thurner |
| Event-by-event simulation of quantum phenomena |
| Speaker: | Hans De Raedt (Department of Applied Physics, Zernike Institute for Advanced Materials, University of Groningen) |
| Abstract: | We review a discrete-event simulation approach that does not require the knowledge of the solution of a wave equation of the whole system, yet reproduces the statistical distributions of wave theory by generating detection events one-by-one. This event-based approach, which gives a unified cause-and-effect description of quantum optics experiments such as single-photon Mach-Zehnder interferometer, Wheeler’s delayed choice, photon tunneling, quantum eraser, double-slit, Einstein-Podolsky-Rosen-Bohm and Hanbury Brown-Twiss experiments [1], is illustrated by application to single-neutron interferometry experiments that violate a Bell inequality [2].
[1] K. Michielsen, F. Jin, and H. De Raedt, J. Comp. Theor. Nanosci. 8, 1052 – 1080 (2011) (http://rugth30.phys.rug.nl/pdf/qo2.pdf).
[2] Y. Hasegawa, R. Loidl, G. Badurek, M. Baron, and H. Rauch, Nature 425, 45 (2003).
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| Date: | Fri, 20.01.2012 |
| Time: | 15:30 |
| Location: | Hörsaal Atominstitut, Stadionallee 2, 1020 Wien |
| Contact: | Prof. H. Rauch |
| Projection Operator Methods and Generalized Langevin Equations |
| Speaker: | Florentin Harbich (Univ.Wien) |
| Abstract: | im Rahmen der gemeinsam veranstalteten Seminare "Komplexe Stochastische
Systeme" (Univ.Wien) und "Analyse Komplexer Systeme"(Medizinische
Univ.Wien) |
| Date: | Fri, 20.01.2012 |
| Time: | 16:00 |
| Duration: | 90 min |
| Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien |
| Contact: | H. Hüffel, Stefan Thurner |
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