Calendar of Physics Talks Vienna

Quantum Money from Knots
Speaker:Edward E. Farhi (Center for Theoretical Physics Massachusetts Institute of Technology)
Abstract: Money, either in the form of bills or information on a computer, should be impossible to copy and also verifiable as good money when tendered to a merchant. Quantum mechanics may make this possible to achieve with far greater security than can be achieved without quantum mechanics. Ideally Quantum Money is a cryptographic protocol in which a mint can produce a quantum state, no one can copy the state, and anyone (with a quantum computer) can verify that the state came from the mint without sending the money back to the mint. I will discuss Quantum Money generally and present our scheme based on quantum superpositions of diagrams that encode knots. This scheme is hopefully secure against computationally bounded adversaries and has not yet been broken. Quantum Money may be the basis of E-commerce on a future quantum internet and would not require communication with a central server su
Date: Mon, 22.10.2012
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

Integrable models in two-dimensional quantum field theory
Speaker:Sabina Alazzawi (Uni Wien)
Abstract:We give an overview of known results in the framework of local quantum physics. Possible generalizations are discussed and the connection of integrable models to deformations of QFTs is pointed out.
Date: Tue, 23.10.2012
Time: 12:30
Duration: 60 min
Location:Universität Wien, Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:F. Brünner, S. Frank, P. Köhler, A. G. Passegger, S. Stetina

Entwicklung und Charakterisierung des SPL Plasmagenerators
Speaker:Dr. Claus Schmitzer (CERN, Genf/Schweiz)
Abstract:Im Zuge einer Studie bezüglich des Ausbaus des neuen Linac4 Beschleunigers des CERN zu einem supraleitenden Linearbeschleuniger (SPL) wurde ein neuer Plasmagenerator entwickelt der als Basis für eine zukünftige SPL-Ionenquelle dienen soll um die Anforderungen einer erhöhten Strahlintensität von 80 mA, längeren Pulsen von bis zu 1.2 ms und einer höheren Wiederholrate von bis zu 50 Hz zu erfüllen. Sowohl die Linac4, als auch die zukünftige SPL Quelle wurden entwickelt um H- Ionen zu liefern um den Strahleinschuss in den darauffolgenden PS Booster zu optimieren. Im Zuge der Entwicklung des neuen SPL Plasmagenerators wurde der Elektroneneinschluss im Multicusp-Feld studiert, der gepulste Gaseinschuss mit einem vereinfachten Leitwertmodell untersucht sowie ein thermisches Modell des Generators zu Rate gezogen. Für die experimentellen Untersuchungen wurde ein eigener Teststand entwickelt um La
Date: Tue, 23.10.2012
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. Herbert Störi

Lightlike lines and time functions in gerneral relativity
Speaker:Ettore Minguzzi (Pisa)
Abstract:im Rahmen des Literaturseminars
Date: Wed, 24.10.2012
Time: 14:15
Duration: 60 min
Location:Arbeitsgruppe: Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock
Contact:R. Beig

Mass modes in soft collinear effective theory
Speaker:Piotr Pietrulewicz (Uni Wien)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Thu, 25.10.2012
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, H. Neufeld

Magnetoelectric coupling and dynamics of topological defects in Mott insulators
Speaker:Prof. Maxim Mostovoy (University of Groningen)
Abstract:Multiferroic materials with their coexisting orders of electric and magnetic dipoles may find many technological applications, such as magnetoelectric random access memory, that excel by their low power consumption. Recent progress in the field of multiferroics led to discovery of many new compounds and spectacular magnetoelectric effects, e.g. the magnetically-induced rotation of electric polarization, the giant increase of dielectric constant in an applied magnetic field and the excitation of spin waves by the electric field of a light wave. I will discuss interactions between spin and charge degrees of freedom in Mott insulators giving rise to these effects and, in particular, a new dynamic magnetoelectric interaction which allows for control of domain walls and skyrmions with an applied electric field and is closely related to the so-called spinmotive force in magnetic conductors.
Date: Thu, 25.10.2012
Time: 16:00
Duration: 50 min
Location:Room 138B (TU Freihaus 7 floor, red)
Contact:Andrei Pimenov