Video Library

Since 2002 Perimeter Institute has been recording seminars, conference talks, public outreach events such as talks from top scientists 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 and 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.

Accessibly by anyone with internet, Perimeter aims to share the power and wonder of science with this free library.

Random bipartite entanglement from W and W-like states

Monday Sep 25, 2006
Speaker(s):

We describe a protocol for distilling maximally entangled bipartite states between random pairs of parties (random entanglement'') from those sharing a tripartite W state, and show that this may be done at a higher rate than distillation of bipartite entanglement between specified pairs of parties (specified entanglement'').

Scientific Areas:

Probability theory --classical, quantum and otherwise

Friday Sep 22, 2006
Speaker(s):

Quantum mechanics is a non-classical probability calculus -- but hardly the most general one imaginable. In this talk, I'll discuss some familiar non-classical properties of quantum-probabilistic models that turn out to be features of {em all} non-classical models. These include a generic no-cloning theorem obtained in recent work with Howard Barnum, Jon Barrett and Matt Leifer.

Scientific Areas:

Three Tales of Entanglement

Thursday Sep 21, 2006
Speaker(s):

Entanglement is one of the most studied features of quantum mechanics and in particular quantum information. Yet its role in quantum information is still not clearly understood. Results such as (R. Josza and N. Linden, Proc. Roy. Soc. Lond. A 459, 2011 (2003)) show that entanglement is necessary, but stabilizer states and the Gottesman-Knill theorem (for example) imply that it is far from sufficient. I will discuss three aspects of entanglement. First, a quantum circuit with a "vanishingly small" amount of entanglement that admits an apparent exponential speed-up over the classical case.

Scientific Areas:

The Learnability of Quantum States

Wednesday Sep 20, 2006
Speaker(s):

Traditional quantum state tomography requires a number of measurements that grows exponentially with the number of qubits n. But using ideas from computational learning theory, I'll show that "for most practical purposes" one can learn a quantum state using a number of measurements that grows only linearly with n. I'll discuss applications of this result in experimental physics and quantum computing theory, as well as possible implications for the foundations of quantum mechanics. quant-ph/0608142

Collection/Series:
Scientific Areas:

Counting BPS states on the Quintic

Tuesday Sep 19, 2006
Speaker(s):
Collection/Series:
Scientific Areas:

M-theory Signatures in the CMB

Tuesday Sep 19, 2006
Speaker(s):

I will demonstrate how one can realize Cascade inflation in M-theory. Cascade inflation is a realization of assisted inflation which is driven by non-perturbative interactions of N M5-branes. Its power spectrum possesses three distinctive signatures: a decisive power suppression at small scales, oscillations around the scales that cross the horizon when the inflaton potential jumps and stepwise decrease in the scalar spectral index. All three properties result from features in the inflaton potential.

Collection/Series:
Scientific Areas:

Incorporating Gravity into Bohmian Mechanics: A New Approach

Tuesday Sep 19, 2006
Speaker(s):

My field is the foundations of quantum mechanics, in particular Bohmian mechanics, a non-relativistic theory that is empirically equivalent to standard quantum mechanics while solving all of its paradoxes in an elegant and simple way, essentially by assuming that particles have trajectories.

Scientific Areas:

Before the Big Bang: an Outrageous Solution to a Profound Cosmological Puzzle

Tuesday Sep 12, 2006
Speaker(s):
Collection/Series:
Scientific Areas:

Giant Magnons

Tuesday Sep 12, 2006
Speaker(s):

Studies of ${cal N}=4$ super Yang Mills operators with large R-charge have shown that, in the planar limit, the problem of computing their dimensions can be viewed as a certain spin chain. These spin chains have fundamental magnon\'\' excitations which obey a dispersion relation that is periodic in the momentum of the magnons. This result for the dispersion relation was also shown to hold at arbitrary \'t Hooft coupling. Here we identify these magnons on the string theory side and we show how to reconcile a periodic dispersion relation with the continuum worldsheet description.

Collection/Series:
Scientific Areas:

Inflationary cosmological pertubations of quantum mechanical origin

Friday Sep 08, 2006
Speaker(s):
Scientific Areas:

Lectures On-Demand

Watch on Perimeter's