Video Library

Since 2002 Perimeter Institute has been recording seminars, conference talks, and public outreach events using video cameras installed in our lecture theatres.  Perimeter now has 7 formal presentation spaces for its many scientific conferences, seminars, workshops and educational outreach activities, all with advanced audio-visual technical capabilities.  Recordings of events in these areas are all available On-Demand from this Video Library and on Perimeter Institute Recorded Seminar Archive (PIRSA)PIRSA is a permanent, free, searchable, and citable archive of recorded seminars from relevant bodies in physics. This resource has been partially modelled after Cornell University's arXiv.org. 

  

 

Tuesday Aug 18, 2009
Speaker(s): 

Physics emerged from the twentieth century with two remarkably successful descriptions of nature which stand in striking contrast. Quantum mechanics describes the subatomic realm with intrinsic uncertainties and probabilities. On the other hand, Einstein's general relativity describe gravitational phenomena in an exacting geometric arena. Theoretical physicists have struggled for over fifty years trying to combine these views in a single unified framework. More recently, superstring theory has drawn a huge amount of interest as a leading contender to provide such a unification.

Collection/Series: 
Scientific Areas: 

 

Monday Aug 17, 2009
Speaker(s): 

A game that illustrates that quantum theory requires non-locality; an overview of the concept and basic mathematics of entanglement; and the concept of spin introduced via a Stern Gerlach set-up.

Collection/Series: 
Scientific Areas: 

 

Saturday Aug 15, 2009
Speaker(s): 

The normalized-state spaces of finite-dimensional Jordan algebras constitute a relatively narrow class of convex sets that includes the finite-dimensional quantum mechanical and classical state spaces. Several beautiful mathematical characterizations of Jordan statespaces exist, notably Koecher's characterization as the bases of homogeneous self-dual cones, and Alfsen and Shultz's characterization based on the notion of spectral convex sets plus additional axioms.

Scientific Areas: 

 

Saturday Aug 15, 2009
Speaker(s): 

The Quantum Bayesianism of Caves, Fuchs and Schack presents a distinctive starting point from which to attack the problem of axiomatising - or re-constructing - quantum theory. However, many have had the doubt that this starting point is itself already too radical. In this talk I will briefly introduce the position (it will be familiar to most, no doubt) and describe what I take to be its philosophical standpoint. More importantly, I shall seek to defend it from some bad objections, before going on to level some more substantive challenges.

Scientific Areas: 

 

Saturday Aug 15, 2009

Quantum Mechanics (QM) is a beautiful simple mathematical structure--- Hilbert spaces and operator algebras---with an unprecedented predicting power in the whole physical domain. However, after more than a century from its birth, we still don't have a "principle" from which to derive the mathematical framework. The situation is similar to that of Lorentz transformations before the advent of the relativity principle.

Scientific Areas: 

 

Friday Aug 14, 2009
Speaker(s): 

Recent advances in quantum computation and quantum information theory have led to revived interest in, and cross-fertilisation with, foundational issues of quantum theory. In particular, it has become apparent that quantum theory may be interpreted as but a variant of the classical theory of probability and information. While the two theories may at first sight appear widely different, they actually share a substantial core of common properties; and their divergence can be reduced to a single attribute only, their respective degree of agent-dependency.

Scientific Areas: 

 

Friday Aug 14, 2009
Speaker(s): 

The starting point of the reconstruction process is a very simple quantum logical structure on which probability measures (states) and conditional probabilities are defined. This is a generalization of Kolmogorov's measure-theoretic approach to probability theory. In the general framework, the conditional probabilities need neither exist nor be uniquely determined if they exist. Postulating their existence and uniqueness becomes the major step in the reconstruction process.

Scientific Areas: 

 

Friday Aug 14, 2009
Speaker(s): 


In this talk we provide four postulates that are more natural than the usual postulates of QT.  The postulates require the predefinition of two integers, K and N, for a system. K is the number of probabilities that must be listed to specify the state.  N is the maximum number of states that can be distinguished in a single shot measurement and consequently log N is the information carrying capacity. The postulates are

Scientific Areas: 

Pages

Next Public Lecture

Check back for details on the next lecture in Perimeter's Public Lectures Series