Calendar of Physics Talks Vienna

Reconstruction of Quantum Theory: Bits, Locality, Continuity
Speaker:Borivoje Dakic (Uni Wien)
Abstract:Quantum theory makes the most accurate empirical predictions and yet it lacks simple, more easily comprehensible physical principles from which the theory can be derived uniquely. A broad class of probabilistic theories exist which all share features with quantum theory, such as probabilistic predictions for individual outcomes (indeterminism), impossibility of information transfer faster than the light velocity (no-signaling) or impossibility of copying of unknown states (no-cloning). A vast majority of attempts to find physical principles behind quantum theory fall short of singling out quantum theory uniquely or are based on abstract mathematical assumptions that call themselves for a more compelling physical motivation. Here, we reconstruct quantum theory from three reasonable axioms: (1) (Information capacity) All systems of information carrying capacity of one bit have the same properties, (2) (Locality) The state of a composite system is completely determined by measurements on subsystems, (3) (Continuity) Between any two pure states (i.e. states for which there is a measurement with a definite outcome) there exists a continuous reversible transformation. We show that probability theories different than quantum theory cannot exhibit entanglement and thus non-classical correlations that violate local realism unless that are in conflict with one or more axioms. Lunch Club Overview
Date: Tue, 27.10.2009
Time: 12:30
Duration: 60 min
Location:University of Vienna, Boltzmanngasse 5, 5th Floor, Large Seminar Room
Contact:Max Attems, David Burke, Marcus Huber, Theo Adaktylos

Lise-Meitner-Lecture: Symmetries - Exact and Broken
Speaker:Cecilia Jarlskog (Lund University )
Abstract:Öffentlicher Vortrag in englischer Sprache
Date: Wed, 28.10.2009
Time: 18:00
Location:Marietta-Blau-Saal - Kleinen Festsaal der Universität Wien