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13/14 PSI - Beyond the Standard Model - Lecture 3

Robert Mann University of Waterloo

February 21, 2014 PIRSA:14020053
13/14 PSI - Quantum Gravity Review - Lecture 4

Bianca Dittrich Perimeter Institute for Theoretical Physics

February 21, 2014 PIRSA:14020064
13/14 PSI - Quantum Information Review - Lecture 4

Andrew Childs University of Waterloo

February 21, 2014 PIRSA:14020075
Black Holes- the Harmonic Oscillators of the 21st Century

Andrew Strominger Harvard University
March 12, 2014 PIRSA:14030104
Quantum Fields and Strings
Maximal Privacy Without Coherence

Debbie Leung Institute for Quantum Computing (IQC)
March 12, 2014 PIRSA:14030105
Quantum Information
Asymptotic Symmetries of Gauge and Gravity Theories in Minkowski Space

Andrew Strominger Harvard University
March 13, 2014 PIRSA:14030087
Strong Gravity
Introduction to Quantum Field Theory for Cosmology - Lecture 18

Achim Kempf University of Waterloo

March 13, 2014 PIRSA:14030004
Introduction to Effective Field Theories - Lecture 17

Cliff Burgess McMaster University

March 14, 2014 PIRSA:14030075
Are superselection rules fundamental?

Robert Spekkens Perimeter Institute for Theoretical Physics
March 14, 2014 PIRSA:14030114
Condensed Matter
Introduction to Effective Field Theories - Lecture 18

Cliff Burgess McMaster University

March 14, 2014 PIRSA:14030079
13/14 PSI - Explorations in Quantum Information - Lecture 1

David Cory Institute for Quantum Computing (IQC)

March 17, 2014 PIRSA:14030029
13/14 PSI - Explorations in Condensed Matter - Lecture 1

Guifre Vidal Google

March 17, 2014 PIRSA:14040022

13/14 PSI - Beyond the Standard Model - Lecture 3

Robert Mann University of Waterloo

February 21, 2014 PIRSA:14020053
13/14 PSI - Quantum Gravity Review - Lecture 4

Bianca Dittrich Perimeter Institute for Theoretical Physics

February 21, 2014 PIRSA:14020064
13/14 PSI - Quantum Information Review - Lecture 4

Andrew Childs University of Waterloo

February 21, 2014 PIRSA:14020075
Black Holes- the Harmonic Oscillators of the 21st Century

Andrew Strominger Harvard University
March 12, 2014 PIRSA:14030104
Quantum Fields and Strings
In the twentieth century, many problems across all of physics were solved by perturbative methods which reduced them to harmonic oscillators. Black holes are poised to play a similar role for the problems of twenty-first century physics. They are at once the simplest and most complex objects in the physical universe. They are maximally complex in that the number of possible microstates, or entropy, of a black hole is believed to saturate a universal bound. They are maximally simple in that, according to Einstein's theory, they are featureless holes in space characterized only by their mass, charge and angular momentum. This dual relation between simplicity and complexity, as expressed in black holes, has recently been successfully applied to problems in a disparate variety of physical systems. I will give an introduction to the subject intended for a general audience.
Maximal Privacy Without Coherence

Debbie Leung Institute for Quantum Computing (IQC)
March 12, 2014 PIRSA:14030105
Quantum Information
Privacy and coherence have long been considered closely related properties of a quantum state. Indeed, a coherently transmitted quantum state is inherently private. Surprisingly, coherent quantum communication is not always required for privacy: there are quantum channels that are too noisy to transmit quantum information but it can send private classical information. Here, we ask how different the private classical and the quantum capacities can be. We present a class of channels N_d with input dimension d^2, quantum capacity Q(N_d) <= 1, and private classical capacity P(N_d) = log d. These channels asymptotically saturate an interesting inequality P(N) <= (log d_A + Q(N))/2 for any channel N with input dimension d_A, and capture the essence of privacy stripped of the confounding influence of coherence.
Asymptotic Symmetries of Gauge and Gravity Theories in Minkowski Space

Andrew Strominger Harvard University
March 13, 2014 PIRSA:14030087
Strong Gravity
We argue that the infinite-dimensional BMS symmetry discovered by Bondi et. al in the 60s provides an exact symmetry of the quantum gravity S-matrix. The Ward identity of this symmetry is shown to be precisely Weinberg's soft graviton theorem, also discovered in the 60s. A parallel infinite-dimensional symmetry is found to be generated in nonabelian gauge theories by gauge transformations which go to an angle-dependent finite constant at null infinity. The Ward identity of this symmetry is shown to be the soft gluon theorem.
Introduction to Quantum Field Theory for Cosmology - Lecture 18

Achim Kempf University of Waterloo

March 13, 2014 PIRSA:14030004
Introduction to Effective Field Theories - Lecture 17

Cliff Burgess McMaster University

March 14, 2014 PIRSA:14030075
Are superselection rules fundamental?

Robert Spekkens Perimeter Institute for Theoretical Physics
March 14, 2014 PIRSA:14030114
Condensed Matter
Superselection rules in quantum theory assert the impossibility of preparing coherent superpositions of certain conserved quantities. For instance, it is commonly presumed that there is a superselection rule for charge and for baryon number, as well as a "univalence superselection rule" forbidding a coherent superposition of a fermion and a boson. I will show how many superselection rules can be effectively lifted using a reference frame for the variable that is conjugate to the conserved quantity. I will also discuss subtleties related to the univalence superselection rule.
Introduction to Effective Field Theories - Lecture 18

Cliff Burgess McMaster University

March 14, 2014 PIRSA:14030079
13/14 PSI - Explorations in Quantum Information - Lecture 1

David Cory Institute for Quantum Computing (IQC)

March 17, 2014 PIRSA:14030029
13/14 PSI - Explorations in Condensed Matter - Lecture 1

Guifre Vidal Google

March 17, 2014 PIRSA:14040022

Title	Speaker(s)	Date	Collection	Type	Info	Relevance
13/14 PSI - Beyond the Standard Model - Lecture 3	Robert Mann	2014‑02‑21	13/14 PSI - Beyond the Standard Model	Course	View details	1
13/14 PSI - Quantum Gravity Review - Lecture 4	Bianca Dittrich	2014‑02‑21	13/14 PSI - Quantum Gravity Review	Course	View details	1
13/14 PSI - Quantum Information Review - Lecture 4	Andrew Childs	2014‑02‑21	13/14 PSI - Quantum Information Review	Course	View details	1
Black Holes- the Harmonic Oscillators of the 21st Century	Andrew Strominger	2014‑03‑12	Colloquium	Scientific Series	View details	1
Maximal Privacy Without Coherence	Debbie Leung	2014‑03‑12	Perimeter Institute Quantum Discussions	Scientific Series	View details	1
Asymptotic Symmetries of Gauge and Gravity Theories in Minkowski Space	Andrew Strominger	2014‑03‑13	Strong Gravity	Scientific Series	View details	1
Introduction to Quantum Field Theory for Cosmology - Lecture 18	Achim Kempf	2014‑03‑13	Quantum Field Theory for Cosmology - 2014	Course	View details	1
Introduction to Effective Field Theories - Lecture 17	Cliff Burgess	2014‑03‑14	Introduction to Effective Field Theories	Course	View details	1
Are superselection rules fundamental?	Robert Spekkens	2014‑03‑14	Condensed Matter	Scientific Series	View details	1
Introduction to Effective Field Theories - Lecture 18	Cliff Burgess	2014‑03‑14	Introduction to Effective Field Theories	Course	View details	1
13/14 PSI - Explorations in Quantum Information - Lecture 1	David Cory	2014‑03‑17	13/14 PSI - Explorations in Quantum Information	Course	View details	1
13/14 PSI - Explorations in Condensed Matter - Lecture 1	Guifre Vidal	2014‑03‑17	13/14 PSI - Explorations in Condensed Matter	Course	View details	1

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