Clarifying holographic charges
Donald Marolf - University of California, Santa Barbara
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Audience Night
Laurent Freidel - Perimeter Institute for Theoretical Physics , Joseph Emerson - Institute for Quantum Computing (IQC) , Thomas Thiemann - University of Erlangen-Nuremberg , Rafael Sorkin - Perimeter Institute for Theoretical Physics , Cliff Burgess - McMaster University , Christian Romelsberger - Apple Inc.
Astrobiology, homochirality, and the origin of life
Axel Brandenburg - Nordic Institute for Theoretical Physics
A unified and generalized approach to quantum error correction
David Kribs - University of Guelph
Relaxation and unitarity in eternal black hole
Sergey Solodukhin - Université de Tours
Aspects of c < 1 String with Time-like Linear Dilaton Matter
Tadashi Takayanagi - Yukawa Institute for Theoretical Physics
PSI 2017/2018 - String Theory - Lecture 5
Davide Gaiotto - Perimeter Institute for Theoretical Physics
Ghosts and other terrors - BRST gauge fixing.
PSI 2017/2018 - Quantum Information - Lecture 4
Daniel Gottesman - University of Maryland, College Park
Superconducting qubits
PSI 2017/2018 - String Theory - Lecture 4
Davide Gaiotto - Perimeter Institute for Theoretical Physics
The string spectrum.
From superradiance to superfluidity: effective theories of point-like particles
Riccardo Penco - University of Pennsylvania
We are fortunate to live in an era of great discoveries in particle physics and cosmology, and most of the theoretical understanding that made this possibile is based on effective field theories. In this talk, I will show how these powerful techniques can be applied across the spectrum of…
PSI 2017/2018 - Quantum Information - Lecture 3
Daniel Gottesman - University of Maryland, College Park
DiVincenzo Criteria, Ion traps
A web of dualities in many-body quantum physics
Chong Wang - Perimeter Institute for Theoretical Physics
Two seemingly different quantum field theories may secretly describe the same underlying physics — a phenomenon known as “duality”. Duality has been proved powerful in condensed matter physics, since many difficult questions can be drastically simplified in certain “dual” pictures. This is…
PSI 2017/2018 - String Theory - Lecture 3
Davide Gaiotto - Perimeter Institute for Theoretical Physics
The two-dimensional free boson: mode expansion, fock space; symmetries; the stress energy tensor and the Virasoro algebra.
Black Holes, Quantum Information, and Unification
Raphael Bousso - University of California, Berkeley
The study of black holes has revealed a deep connection between quantum information and spacetime geometry. Its origin must lie in a quantum theory of gravity, so it offers a valuable hint in our search for a unified theory. Precise formulations of this relation recently led to new insights in…
PSI 2017/2018 - Quantum Information - Lecture 2
Daniel Gottesman - University of Maryland, College Park
Universal gate sets, no-cloning theorem, teleportation, distance between q. states (fidelity and trace distance)
Symplectic resolutions of quiver varieties
Gwyn Bellamy - University of Glasgow
Quiver varieties, as introduced by Nakaijma, play a key role in representation theory. They give a very large class of symplectic singularities and, in many cases, their symplectic resolutions too. However, there seems to be no general criterion in the literature for when a quiver variety admits a…
Universal Limit on Communication
Raphael Bousso - University of California, Berkeley
I derive a universal upper bound on the capacity of any communication channel between two distant systems. The Holevo quantity, and hence the mutual information, is at most of order EΔt/ℏ, where E the average energy of the signal, and Δt is the amount of time for which detectors operate. The bound…
PSI 2017/2018 - String Theory - Lecture 2
Davide Gaiotto - Perimeter Institute for Theoretical Physics
Path integral for a scalar field; Strings: Nambu Goto action, Polyakov action, Weyl symmetry, gauge fixing, Riemman surface, critical string.