Talks

11665 - 11676 of 19959 Results

A histories perpective on bounding quantum correlations

Joe Henson BNP Paribas Asset Management London

March 18, 2014

PIRSA:14030111

Quantum Physics
Before the Bang

Raman Sundrum University of Maryland, College Park

March 18, 2014

PIRSA:14030113

High Energy Physics
13/14 PSI - Explorations in String Theory - Lecture 2

Andrei Starinets University of Oxford

March 18, 2014

PIRSA:14030060
Inflation After Planck

March 18, 2014

PIRSA:14030116

Astrophysics
13/14 PSI - Explorations in Condensed Matter - Lecture 2

Guifre Vidal Alphabet (United States)

March 18, 2014

PIRSA:14040023
13/14 PSI - Explorations in Quantum Information - Lecture 2

David Cory Institute for Quantum Computing (IQC)

March 18, 2014

PIRSA:14030030
Seeing is Believing: Direct Observation of a General Quantum State

Jeff Lundeen University of Ottawa

March 17, 2014

PIRSA:14030110

Quantum Physics
13/14 PSI - Explorations in String Theory - Lecture 1

Andrei Starinets University of Oxford

March 17, 2014

PIRSA:14030059
13/14 PSI - Explorations in Condensed Matter - Lecture 1

Guifre Vidal Alphabet (United States)

March 17, 2014

PIRSA:14040022
13/14 PSI - Explorations in Quantum Information - Lecture 1

David Cory Institute for Quantum Computing (IQC)

March 17, 2014

PIRSA:14030029
Introduction to Effective Field Theories - Lecture 18

Cliff Burgess McMaster University

March 14, 2014

PIRSA:14030079
Are superselection rules fundamental?

Robert Spekkens Perimeter Institute for Theoretical Physics

March 14, 2014

PIRSA:14030114

Condensed Matter

A histories perpective on bounding quantum correlations

Joe Henson BNP Paribas Asset Management London

March 18, 2014

PIRSA:14030111

Quantum Physics

There has recently been much interest in finding simple principles that explain the particular sets of experimental probabilities that are possible with quantum mechanics in Bell-type experiments. In the quantum gravity community, similar questions had been raised, about whether a certain generalisation of quantum mechanics allowed more than quantum mechanics in this regard. We now bring these two strands of work together to see what can be learned on both sides.
Before the Bang

Raman Sundrum University of Maryland, College Park

March 18, 2014

PIRSA:14030113

High Energy Physics

The simplest black hole solution in asymptotic AdS spacetime, the eternal 3-dimensional BTZ black hole, is studied from the viewpoint of AdS/CFT duality. We identify a class of non-local correlators on the CFT side that allow us to generalize the notion of quantum gravity "S-matrix" to scattering inside the horizon. Since the interior of the horizon is a cosmological spacetime with a big bang/crunch-like singularity, our construction can be interpreted as identifying generally coordinate invariant observables of quantum gravity in a simple cosmology. We show in a certain precise sense, that these holographic observables lie "before the big bang" in a region of spacetime containing closed timelike curves. A central tool in our analysis is the realization of BTZ as a quotient of 3-dimensional AdS.
13/14 PSI - Explorations in String Theory - Lecture 2

Andrei Starinets University of Oxford

March 18, 2014

PIRSA:14030060
Inflation After Planck

March 18, 2014

PIRSA:14030116

Astrophysics

The Planck satellite measurement of the cosmic microwave background has provided spectacular confirmation of the predictions of inflationary cosmology, putting inflation on a firm footing as the leading theory of the very early universe. I will discuss the implications of Planck for the simplest canonical single-field inflation models, which are favored by the data. Then I will discuss the most general question: How strong is the case that inflation is the "right" theory of the early universe?
13/14 PSI - Explorations in Condensed Matter - Lecture 2

Guifre Vidal Alphabet (United States)

March 18, 2014

PIRSA:14040023
13/14 PSI - Explorations in Quantum Information - Lecture 2

David Cory Institute for Quantum Computing (IQC)

March 18, 2014

PIRSA:14030030
Seeing is Believing: Direct Observation of a General Quantum State

Jeff Lundeen University of Ottawa

March 17, 2014

PIRSA:14030110

Quantum Physics

Central to quantum theory, the wavefunction is a complex distribution associated with a quantum system. Despite its fundamental role, it is typically introduced as an abstract element of the theory with no explicit definition. Rather, physicists come to a working understanding of it through its use to calculate measurement outcome probabilities through the Born Rule. Tomographic methods can reconstruct the wavefunction from measured probabilities. In contrast, I present a method to directly measure the wavefunction so that its real and imaginary components appear straight on our measurement apparatus. I will also present new work extending this concept to mixed quantum states. This extension directly measures a little-known proposal by Dirac for a classical analog to a quantum operator. Furthermore, it reveals that our direct measurement is a rigorous example of a quasi-probability phase-space (i.e. x,p) distribution that is closely related to the Q, P, and Wigner functions. Our direct measurement method gives the quantum state a plain and general meaning in terms of a specific set of simple operations in the lab.
13/14 PSI - Explorations in String Theory - Lecture 1

Andrei Starinets University of Oxford

March 17, 2014

PIRSA:14030059
13/14 PSI - Explorations in Condensed Matter - Lecture 1

Guifre Vidal Alphabet (United States)

March 17, 2014

PIRSA:14040022
13/14 PSI - Explorations in Quantum Information - Lecture 1

David Cory Institute for Quantum Computing (IQC)

March 17, 2014

PIRSA:14030029
Introduction to Effective Field Theories - Lecture 18

Cliff Burgess McMaster University

March 14, 2014

PIRSA:14030079
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.

Title	Date	Collection	Type	Info
A histories perpective on bounding quantum correlations	2014‑03‑18	Quantum Foundations	Scientific Series	View details
Before the Bang	2014‑03‑18	Particle Physics	Scientific Series	View details
13/14 PSI - Explorations in String Theory - Lecture 2	2014‑03‑18	13/14 PSI - Explorations in String Theory	Course	View details
Inflation After Planck	2014‑03‑18	Cosmology and Gravitation	Scientific Series	View details
13/14 PSI - Explorations in Condensed Matter - Lecture 2	2014‑03‑18	13/14 PSI - Explorations in Condensed Matter	Course	View details
13/14 PSI - Explorations in Quantum Information - Lecture 2	2014‑03‑18	13/14 PSI - Explorations in Quantum Information	Course	View details
Seeing is Believing: Direct Observation of a General Quantum State	2014‑03‑17	Quantum Foundations	Scientific Series	View details
13/14 PSI - Explorations in String Theory - Lecture 1	2014‑03‑17	13/14 PSI - Explorations in String Theory	Course	View details
13/14 PSI - Explorations in Condensed Matter - Lecture 1	2014‑03‑17	13/14 PSI - Explorations in Condensed Matter	Course	View details
13/14 PSI - Explorations in Quantum Information - Lecture 1	2014‑03‑17	13/14 PSI - Explorations in Quantum Information	Course	View details
Introduction to Effective Field Theories - Lecture 18	2014‑03‑14	Introduction to Effective Field Theories	Course	View details
Are superselection rules fundamental?	2014‑03‑14	Quantum Matter	Scientific Series	View details

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Format results

A histories perpective on bounding quantum correlations

Before the Bang

13/14 PSI - Explorations in String Theory - Lecture 2

Inflation After Planck

13/14 PSI - Explorations in Condensed Matter - Lecture 2

13/14 PSI - Explorations in Quantum Information - Lecture 2

Seeing is Believing: Direct Observation of a General Quantum State

13/14 PSI - Explorations in String Theory - Lecture 1

13/14 PSI - Explorations in Condensed Matter - Lecture 1

13/14 PSI - Explorations in Quantum Information - Lecture 1

Introduction to Effective Field Theories - Lecture 18

Are superselection rules fundamental?

A histories perpective on bounding quantum correlations

Before the Bang

13/14 PSI - Explorations in String Theory - Lecture 2

Inflation After Planck

13/14 PSI - Explorations in Condensed Matter - Lecture 2

13/14 PSI - Explorations in Quantum Information - Lecture 2

Seeing is Believing: Direct Observation of a General Quantum State

13/14 PSI - Explorations in String Theory - Lecture 1

13/14 PSI - Explorations in Condensed Matter - Lecture 1

13/14 PSI - Explorations in Quantum Information - Lecture 1

Introduction to Effective Field Theories - Lecture 18

Are superselection rules fundamental?