Talks

9517 - 9528 of 18076 Results

Introduction to Quantum Field Theory for Cosmology - Lecture 23

Achim Kempf University of Waterloo

April 01, 2014

PIRSA:14040000
Incompatibility of observables in quantum theory and other probabilistic theories

April 01, 2014

PIRSA:14040075

Quantum Physics
Fibonacci Anyons From Abelian Bilayer Quantum Hall States

Abolhassan Vaezi Cornell University

April 01, 2014

PIRSA:14040120

Condensed Matter
RG flows with N=1 supersymmetry

Henriette Elvang University of Michigan–Ann Arbor

April 01, 2014

PIRSA:14030074

High Energy Physics
13/14 PSI - Explorations in String Theory - Lecture 12

Andrei Starinets University of Oxford

April 01, 2014

PIRSA:14040017
The not-so-homogeneous universe

Phil Bull Queen Mary University of London

April 01, 2014

PIRSA:14040129

Astrophysics
13/14 PSI - Explorations in Condensed Matter - Lecture 12

Guifre Vidal Alphabet (United States)

April 01, 2014

PIRSA:14040038
13/14 PSI - Explorations in Quantum Information - Lecture 12

David Cory Institute for Quantum Computing (IQC)

April 01, 2014

PIRSA:14040009
13/14 PSI - Explorations in String Theory - Lecture 11

Andrei Starinets University of Oxford

March 31, 2014

PIRSA:14030073
13/14 PSI - Explorations in Condensed Matter - Lecture 11

Guifre Vidal Alphabet (United States)

March 31, 2014

PIRSA:14040037
13/14 PSI - Explorations in Quantum Information - Lecture 11

David Cory Institute for Quantum Computing (IQC)

March 31, 2014

PIRSA:14030043
Introduction to Effective Field Theories - Lecture 20

Cliff Burgess McMaster University

March 28, 2014

PIRSA:14030080

Introduction to Quantum Field Theory for Cosmology - Lecture 23

Achim Kempf University of Waterloo

April 01, 2014

PIRSA:14040000
Incompatibility of observables in quantum theory and other probabilistic theories

April 01, 2014

PIRSA:14040075

Quantum Physics

We introduce a new way of quantifying the degrees of incompatibility of two observables in a probabilistic physical theory and, based on this, a global measure of the degree of incompatibility inherent in such theories. This opens up a flexible way of comparing probabilistic theories with respect to the nonclassical feature of incompatibility. We show that quantum theory contains observables that are as incompatible as any probabilistic physical theory can have. In particular, we prove that two of the most common pairs of complementary observables (position and momentum; number and phase) are maximally incompatible. However, if one adopts a more refined measure of the degree of incompatibility, for instance, by restricting the comparison to binary observables, it turns out that there are probabilistic theories whose inherent degree of incompatibility is greater than that of quantum theory. Finally, we analyze the noise tolerance of the incompatibility of a pair of observables in a CHSH-Bell experiment.
Fibonacci Anyons From Abelian Bilayer Quantum Hall States

Abolhassan Vaezi Cornell University

April 01, 2014

PIRSA:14040120

Condensed Matter

The possibility of realizing non-Abelian statistics and utilizing it for topological quantum computation (TQC) has generated widespread interest. However, the non-Abelian statistics that can be realized in most accessible proposals is not powerful enough for universal TQC. In this talk, I consider a simple bilayer fractional quantum Hall (FQH) system with the 1/3 Laughlin state in each layer, in the presence of interlayer tunneling. I show that interlayer tunneling can drive a continuous phase transition to an exotic non-Abelian state that contains the famous `Fibonacci' anyon, whose non-Abelian statistics is powerful enough for universal TQC. The analysis that I will present towards this result rests on startling agreements from a variety of distinct methods, including thin torus limits, effective field theories, and coupled wire constructions.

Next, I discuss the experimental aspects of our proposal and potential probes for the Fibonacci phase. I show that the charge gap remains open at the phase transition while the neutral gap closes. This raises the question of whether these exotic phases may have already been realized at nu=2/3 in bilayers, as past experiments may not have definitively ruled them out. Finally, I will discuss about the generalizations to multi-layer states as well as the duality between the interlayer pairing and interlayer tunneling problems.

Reference: arXiv:1403.3383
RG flows with N=1 supersymmetry

Henriette Elvang University of Michigan–Ann Arbor

April 01, 2014

PIRSA:14030074

High Energy Physics

The dilaton effective action plays a key role for the recent proof of the a-theorem by Schwimmer and Komargodski. In the presence of other massless modes, one may ask if this proof is affected. In particular, in renormalization group (RG) flows with N=1 supersymmetry, there is a natural massless partner of the dilaton, namely an axion field. I will discuss RG flows, the a-theorem, and the form of the N=1 supersymmetric dilaton-axion effective action and its physics.
13/14 PSI - Explorations in String Theory - Lecture 12

Andrei Starinets University of Oxford

April 01, 2014

PIRSA:14040017
The not-so-homogeneous universe

Phil Bull Queen Mary University of London

April 01, 2014

PIRSA:14040129

Astrophysics

The assumption of spatial homogeneity lies at the heart of the concordance cosmological model. But as I will discuss, truly solid empirical evidence for global (statistical) homogeneity is lacking, and tricky theoretical issues abound. I review a few recent advances in understanding the role inhomogeneity plays in cosmology, including some unexpected effects on light propagation, the death (and rebirth) of backreaction, and impending observational annoyances related to the lumpy local Universe. I'll also talk about some near-future observations that can give us a handle on these effects
13/14 PSI - Explorations in Condensed Matter - Lecture 12

Guifre Vidal Alphabet (United States)

April 01, 2014

PIRSA:14040038
13/14 PSI - Explorations in Quantum Information - Lecture 12

David Cory Institute for Quantum Computing (IQC)

April 01, 2014

PIRSA:14040009
13/14 PSI - Explorations in String Theory - Lecture 11

Andrei Starinets University of Oxford

March 31, 2014

PIRSA:14030073
13/14 PSI - Explorations in Condensed Matter - Lecture 11

Guifre Vidal Alphabet (United States)

March 31, 2014

PIRSA:14040037
13/14 PSI - Explorations in Quantum Information - Lecture 11

David Cory Institute for Quantum Computing (IQC)

March 31, 2014

PIRSA:14030043
Introduction to Effective Field Theories - Lecture 20

Cliff Burgess McMaster University

March 28, 2014

PIRSA:14030080

Title	Date	Collection	Type	Info
Introduction to Quantum Field Theory for Cosmology - Lecture 23	2014‑04‑01	Quantum Field Theory for Cosmology - 2014	Course	View details
Incompatibility of observables in quantum theory and other probabilistic theories	2014‑04‑01	Quantum Foundations	Scientific Series	View details
Fibonacci Anyons From Abelian Bilayer Quantum Hall States	2014‑04‑01	Quantum Matter	Scientific Series	View details
RG flows with N=1 supersymmetry	2014‑04‑01	Quantum Fields and Strings	Scientific Series	View details
13/14 PSI - Explorations in String Theory - Lecture 12	2014‑04‑01	13/14 PSI - Explorations in String Theory	Course	View details
The not-so-homogeneous universe	2014‑04‑01	Cosmology and Gravitation	Scientific Series	View details
13/14 PSI - Explorations in Condensed Matter - Lecture 12	2014‑04‑01	13/14 PSI - Explorations in Condensed Matter	Course	View details
13/14 PSI - Explorations in Quantum Information - Lecture 12	2014‑04‑01	13/14 PSI - Explorations in Quantum Information	Course	View details
13/14 PSI - Explorations in String Theory - Lecture 11	2014‑03‑31	13/14 PSI - Explorations in String Theory	Course	View details
13/14 PSI - Explorations in Condensed Matter - Lecture 11	2014‑03‑31	13/14 PSI - Explorations in Condensed Matter	Course	View details
13/14 PSI - Explorations in Quantum Information - Lecture 11	2014‑03‑31	13/14 PSI - Explorations in Quantum Information	Course	View details
Introduction to Effective Field Theories - Lecture 20	2014‑03‑28	Introduction to Effective Field Theories	Course	View details

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Format results

Introduction to Quantum Field Theory for Cosmology - Lecture 23

Incompatibility of observables in quantum theory and other probabilistic theories

Fibonacci Anyons From Abelian Bilayer Quantum Hall States

RG flows with N=1 supersymmetry

13/14 PSI - Explorations in String Theory - Lecture 12

The not-so-homogeneous universe

13/14 PSI - Explorations in Condensed Matter - Lecture 12

13/14 PSI - Explorations in Quantum Information - Lecture 12

13/14 PSI - Explorations in String Theory - Lecture 11

13/14 PSI - Explorations in Condensed Matter - Lecture 11

13/14 PSI - Explorations in Quantum Information - Lecture 11

Introduction to Effective Field Theories - Lecture 20

Introduction to Quantum Field Theory for Cosmology - Lecture 23

Incompatibility of observables in quantum theory and other probabilistic theories

Fibonacci Anyons From Abelian Bilayer Quantum Hall States

RG flows with N=1 supersymmetry

13/14 PSI - Explorations in String Theory - Lecture 12

The not-so-homogeneous universe

13/14 PSI - Explorations in Condensed Matter - Lecture 12

13/14 PSI - Explorations in Quantum Information - Lecture 12

13/14 PSI - Explorations in String Theory - Lecture 11

13/14 PSI - Explorations in Condensed Matter - Lecture 11

13/14 PSI - Explorations in Quantum Information - Lecture 11

Introduction to Effective Field Theories - Lecture 20