Talks

10249 - 10260 of 19290 Results

Axions: an ideal cosmological probe of fundamental physics

David Marsh King's College London

October 22, 2014

PIRSA:14100105
A Mathematician Looks at Supergravity and AdS/CFT

Kevin Costello Perimeter Institute for Theoretical Physics

October 22, 2014

PIRSA:14100104
Fundamental Physics Without Colliding Particles

Asimina Arvanitaki Perimeter Institute

October 22, 2014

PIRSA:14100103
PHY 789 - Lecture 2

Niayesh Afshordi University of Waterloo

October 22, 2014

PIRSA:14100123
14/15 PSI - Statistical Mechanics - Lecture 12

Anton Burkov University of Waterloo

October 22, 2014

PIRSA:14100100
14/15 PSI - Conformal Field Theory - Lecture 12

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 22, 2014

PIRSA:14100024
14/15 PSI - Quantum Field Theory I (A) - Lecture 12

Tibra Ali Perimeter Institute for Theoretical Physics

Dan Wohns Perimeter Institute for Theoretical Physics

October 22, 2014

PIRSA:14100043
Entanglement Entropy and the Area Law - Lecture 3

Rafael Sorkin Perimeter Institute for Theoretical Physics

October 21, 2014

PIRSA:14100071
PHY 789 - Lecture 1

Niayesh Afshordi University of Waterloo

October 21, 2014

PIRSA:14100122
Numerical Study of a Bosonic Topological Insulator in Three Dimensions

Scott Geraedts California Institute of Technology

October 21, 2014

PIRSA:14100113

Condensed Matter
14/15 PSI - Conformal Field Theory - Lecture 11

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 21, 2014

PIRSA:14100023
Disturbance in weak measurements and the difference between quantum and classical weak values

Asger Ipsen

October 21, 2014

PIRSA:14100114

Quantum Physics

Axions: an ideal cosmological probe of fundamental physics

David Marsh King's College London

October 22, 2014

PIRSA:14100105
A Mathematician Looks at Supergravity and AdS/CFT

Kevin Costello Perimeter Institute for Theoretical Physics

October 22, 2014

PIRSA:14100104
Fundamental Physics Without Colliding Particles

Asimina Arvanitaki Perimeter Institute

October 22, 2014

PIRSA:14100103
PHY 789 - Lecture 2

Niayesh Afshordi University of Waterloo

October 22, 2014

PIRSA:14100123
14/15 PSI - Statistical Mechanics - Lecture 12

Anton Burkov University of Waterloo

October 22, 2014

PIRSA:14100100
14/15 PSI - Conformal Field Theory - Lecture 12

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 22, 2014

PIRSA:14100024
14/15 PSI - Quantum Field Theory I (A) - Lecture 12

Tibra Ali Perimeter Institute for Theoretical Physics

Dan Wohns Perimeter Institute for Theoretical Physics

October 22, 2014

PIRSA:14100043
Entanglement Entropy and the Area Law - Lecture 3

Rafael Sorkin Perimeter Institute for Theoretical Physics

October 21, 2014

PIRSA:14100071
PHY 789 - Lecture 1

Niayesh Afshordi University of Waterloo

October 21, 2014

PIRSA:14100122
Numerical Study of a Bosonic Topological Insulator in Three Dimensions

Scott Geraedts California Institute of Technology

October 21, 2014

PIRSA:14100113

Condensed Matter

We construct a model which realizes a (3+1)-dimensional symmetry-protected topological phase of bosons with U(1) charge conservation and time reversal symmetry, envisioned by A. Vishwanath and T. Senthil [PRX 4 011016]. Our model works by introducing an additional spin degree of freedom, and binding its hedgehogs to a species of charged bosons. We study the model using Monte Carlo and determine its bulk phase diagram; the phase where the bound states of hedgehogs and charges condense is the topological phase, and we demonstrate this by observing a Witten effect. We also study the surface phase diagram on a (2+1)-dimensional boundary between the topological and trivial insulators. We find a number of exotic phases on the surface, including exotic superfluids, a phase with a Hall conductivity quantized to half the value possible in 2D, and a phase with intrinsic topological order. We also find a new bulk phase with intrinsic topological order.
14/15 PSI - Conformal Field Theory - Lecture 11

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 21, 2014

PIRSA:14100023
Disturbance in weak measurements and the difference between quantum and classical weak values

Asger Ipsen

October 21, 2014

PIRSA:14100114

Quantum Physics

The role of measurement induced disturbance in weak measurements is of central importance for the interpretation of the weak value. Uncontrolled disturbance can interfere with the postselection process and make the weak value dependent on the details of the measurement process. Here we develop the concept of a generalized weak measurement for classical and quantum mechanics. The two cases appear remarkably similar, but we point out some important differences. A priori it is not clear what the correct notion of disturbance should be in the context of weak measurements. We consider three different notions and get three different results: (1) For a `strong' definition of disturbance, we find that weak measurements are disturbing. (2) For a weaker definition we find that a general class of weak measurements are non-disturbing, but that one gets weak values which depend on the measurement process. (3) Finally, with respect to an operational definition of the `degree of disturbance', we find that the AAV weak measurements are the least disturbing, but that the disturbance is still non-zero.

Title	Date	Collection	Type	Info
Axions: an ideal cosmological probe of fundamental physics	2014‑10‑22		Conference	View details
A Mathematician Looks at Supergravity and AdS/CFT	2014‑10‑22		Conference	View details
Fundamental Physics Without Colliding Particles	2014‑10‑22		Conference	View details
PHY 789 - Lecture 2	2014‑10‑22		Course	View details
14/15 PSI - Statistical Mechanics - Lecture 12	2014‑10‑22	14/15 PSI - Statistical Mechanics	Course	View details
14/15 PSI - Conformal Field Theory - Lecture 12	2014‑10‑22	14/15 PSI - Conformal Field Theory	Course	View details
14/15 PSI - Quantum Field Theory I (A) - Lecture 12	2014‑10‑22	14/15 PSI - Quantum Field Theory	Course	View details
Entanglement Entropy and the Area Law - Lecture 3	2014‑10‑21	Entanglement Entropy and the Area Law	Course	View details
PHY 789 - Lecture 1	2014‑10‑21		Course	View details
Numerical Study of a Bosonic Topological Insulator in Three Dimensions	2014‑10‑21	Quantum Matter	Scientific Series	View details
14/15 PSI - Conformal Field Theory - Lecture 11	2014‑10‑21	14/15 PSI - Conformal Field Theory	Course	View details
Disturbance in weak measurements and the difference between quantum and classical weak values	2014‑10‑21	Quantum Foundations	Scientific Series	View details

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Format results

Axions: an ideal cosmological probe of fundamental physics

A Mathematician Looks at Supergravity and AdS/CFT

Fundamental Physics Without Colliding Particles

PHY 789 - Lecture 2

14/15 PSI - Statistical Mechanics - Lecture 12

14/15 PSI - Conformal Field Theory - Lecture 12

14/15 PSI - Quantum Field Theory I (A) - Lecture 12

Entanglement Entropy and the Area Law - Lecture 3

PHY 789 - Lecture 1

Numerical Study of a Bosonic Topological Insulator in Three Dimensions

14/15 PSI - Conformal Field Theory - Lecture 11

Disturbance in weak measurements and the difference between quantum and classical weak values

Axions: an ideal cosmological probe of fundamental physics

A Mathematician Looks at Supergravity and AdS/CFT

Fundamental Physics Without Colliding Particles

PHY 789 - Lecture 2

14/15 PSI - Statistical Mechanics - Lecture 12

14/15 PSI - Conformal Field Theory - Lecture 12

14/15 PSI - Quantum Field Theory I (A) - Lecture 12

Entanglement Entropy and the Area Law - Lecture 3

PHY 789 - Lecture 1

Numerical Study of a Bosonic Topological Insulator in Three Dimensions

14/15 PSI - Conformal Field Theory - Lecture 11

Disturbance in weak measurements and the difference between quantum and classical weak values