Condensed Matter

Displaying 1081 - 1092 of 1225

Wiring up Quantum Systems: Fun with Artificial Atoms and Microwave Photons

Steve Girvin Yale University
November 28, 2012

PIRSA:12110041
Condensed Matter
12/13 PSI Researcher Presentation

Steve Girvin Yale University
November 28, 2012

PIRSA:12110093
Condensed Matter
Entanglement and the Fermi surface

Brian Swingle Brandeis University
November 27, 2012

PIRSA:12110082
Condensed Matter
Twisted quantum double model of topological phases

Yidun Wan Fudan University
November 21, 2012

PIRSA:12110079
Condensed Matter
Twisted quantum double model of topological phases

Yidun Wan Fudan University
November 21, 2012

PIRSA:12110077
Condensed Matter
Superradiant Superconductivity

Baskaran Ganapathy Institute of Mathematical Sciences
November 16, 2012

PIRSA:12110071
Condensed Matter
Synthetic non-Abelian anyons in fractional Chern insulators and beyond

Xiaoliang Qi Stanford University
October 26, 2012

PIRSA:12100051
Condensed Matter
Condensed Matter - Lecture 14

Assa Auerbach Technion – Israel Institute of Technology
October 26, 2012

PIRSA:12100039
Condensed Matter
Condensed Matter - Lecture 13

Assa Auerbach Technion – Israel Institute of Technology
October 25, 2012

PIRSA:12100038
Condensed Matter
Condensed Matter - Lecture 12

Assa Auerbach Technion – Israel Institute of Technology
October 24, 2012

PIRSA:12100037
Condensed Matter
Condensed Matter - Lecture 11

Assa Auerbach Technion – Israel Institute of Technology
October 23, 2012

PIRSA:12100036
Condensed Matter
Condensed Matter - Lecture 10

Assa Auerbach Technion – Israel Institute of Technology
October 22, 2012

PIRSA:12100035
Condensed Matter

Wiring up Quantum Systems: Fun with Artificial Atoms and Microwave Photons

Steve Girvin Yale University
November 28, 2012

PIRSA:12110041
Condensed Matter
A revolution is underway in the construction of ‘artificial atoms’ out of superconducting electrical circuits. These macroscopic ‘atoms’ have quantized energy levels and can emit and absorb quanta of light (in this case microwave photons), just like ordinary atoms. Unlike ‘real’ atoms, the properties of these artificial atoms can be engineered to suit various particular applications, and they can be connected together by wires to form quantum ‘computer chips.’ This so-called ‘circuit QED’ architecture has given us the ability to do non-linear quantum optics in electrical circuits at the single photon level. It is now possible to entangle multiple qubits, count individual microwave photons, create large ‘Schrödinger cat’ photon states and perform quantum feedback. This talk will present an elementary introduction to the field.
12/13 PSI Researcher Presentation

Steve Girvin Yale University
November 28, 2012

PIRSA:12110093
Condensed Matter
Entanglement and the Fermi surface

Brian Swingle Brandeis University
November 27, 2012

PIRSA:12110082
Condensed Matter
In this talk I will describe my work characterizing quantum entanglement in systems with a Fermi surface. This class includes everything from Fermi liquids to exotic spin liquids in frustrated magnets and perhaps even holographic systems. I review my original scaling argument and then describe in detail a number of new precise results on entanglement in Fermi liquids. I will also discuss recent quantum Monte Carlo calculations of Renyi entropies and will argue that we now have a rather complete agreement between theory and numerics for Fermi liquid entanglement. I will also discuss universal crossovers between thermal and entanglement entropy and a class of solvable interacting models where we can prove the universality of the Widom formula for Fermi surface entanglement. If there is time, I will comment on several other topics including fluctuations of conserved quantities and connections to holography.
Twisted quantum double model of topological phases

Yidun Wan Fudan University
November 21, 2012

PIRSA:12110079
Condensed Matter
Twisted quantum double model of topological phases

Yidun Wan Fudan University
November 21, 2012

PIRSA:12110077
Condensed Matter
Superradiant Superconductivity

Baskaran Ganapathy Institute of Mathematical Sciences
November 16, 2012

PIRSA:12110071
Condensed Matter
In Dicke Superradiance, a collection of 2-level atoms interacting with a single boson mode acquires, through quantum coherence, an enhanced emission property and a rich dynamics. We suggest possibility of Dicke superradiance in a BCS superconductor. The necessary 2-level atoms are identified with Anderson pseudo spins seeing a self consistent mean field in k-space. A way to couple these 2-level bose atoms to an external boson mode and create a novel non equilibrium superradiant superconductivity (SRSC) is suggested. Our mechanism offers a hope to realize transient superconductivity, even at room temperatures, in the pseudo gap phase of certain underdoped cuprates. Recent experiments are briefly discussed in this light. Further SRSC exhibits interesting quantum entanglement and superfluorescence properties.
Synthetic non-Abelian anyons in fractional Chern insulators and beyond

Xiaoliang Qi Stanford University
October 26, 2012

PIRSA:12100051
Condensed Matter
An exciting new prospect in condensed matter physics is the possibility of realizing fractional quantum Hall states in simple lattice models without a large external magnetic field, which are called fractional Chern insulators. A fundamental question is whether qualitatively new states can be realized on the lattice as compared with ordinary fractional quantum Hall states. Here we propose new symmetry-enriched topological states, topological nematic states, which are a dramatic consequence of the interplay between the lattice translational symmetry and topological properties of these fractional Chern insulators. The topological nematic states are realized in a partially filled flat band with a Chern number N, which can be mapped to an N-layer quantum Hall system on a regular lattice. However, in the topological nematic states the lattice dislocations become non-Abelian defects which create "worm holes" connecting the effective layers, and effectively change the topology of the space. Such topology-changing defects, which we name as "genons", can also be defined in other physical systems. We develop methods to compute the projective non-abelian braiding statistics of the genons, and we find the braiding is given by adiabatic modular transformations, or Dehn twists, of the topological state on the effective genus g surface. We find situations where the > genons have quantum dimension 2 and can be used for universal topological quantum computing (TQC), while the host topological state is by itself non-universal for TQC.
Condensed Matter - Lecture 14

Assa Auerbach Technion – Israel Institute of Technology
October 26, 2012

PIRSA:12100039
Condensed Matter
Condensed Matter - Lecture 13

Assa Auerbach Technion – Israel Institute of Technology
October 25, 2012

PIRSA:12100038
Condensed Matter
Condensed Matter - Lecture 12

Assa Auerbach Technion – Israel Institute of Technology
October 24, 2012

PIRSA:12100037
Condensed Matter
Condensed Matter - Lecture 11

Assa Auerbach Technion – Israel Institute of Technology
October 23, 2012

PIRSA:12100036
Condensed Matter
Condensed Matter - Lecture 10

Assa Auerbach Technion – Israel Institute of Technology
October 22, 2012

PIRSA:12100035
Condensed Matter

Title	Speaker(s)	Date	Talk Type	Info link
Wiring up Quantum Systems: Fun with Artificial Atoms and Microwave Photons	Steve Girvin	2012-11-28	Scientific Series	View details
12/13 PSI Researcher Presentation	Steve Girvin	2012-11-28	Course	View details
Entanglement and the Fermi surface	Brian Swingle	2012-11-27	Scientific Series	View details
Twisted quantum double model of topological phases	Yidun Wan	2012-11-21	Scientific Series	View details
Twisted quantum double model of topological phases	Yidun Wan	2012-11-21	Other	View details
Superradiant Superconductivity	Baskaran Ganapathy	2012-11-16	Scientific Series	View details
Synthetic non-Abelian anyons in fractional Chern insulators and beyond	Xiaoliang Qi	2012-10-26	Scientific Series	View details
Condensed Matter - Lecture 14	Assa Auerbach	2012-10-26	Course	View details
Condensed Matter - Lecture 13	Assa Auerbach	2012-10-25	Course	View details
Condensed Matter - Lecture 12	Assa Auerbach	2012-10-24	Course	View details
Condensed Matter - Lecture 11	Assa Auerbach	2012-10-23	Course	View details
Condensed Matter - Lecture 10	Assa Auerbach	2012-10-22	Course	View details

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Wiring up Quantum Systems: Fun with Artificial Atoms and Microwave Photons

12/13 PSI Researcher Presentation

Entanglement and the Fermi surface

Twisted quantum double model of topological phases

Twisted quantum double model of topological phases

Superradiant Superconductivity

Synthetic non-Abelian anyons in fractional Chern insulators and beyond

Condensed Matter - Lecture 14

Condensed Matter - Lecture 13

Condensed Matter - Lecture 12

Condensed Matter - Lecture 11

Condensed Matter - Lecture 10

Wiring up Quantum Systems: Fun with Artificial Atoms and Microwave Photons

12/13 PSI Researcher Presentation

Entanglement and the Fermi surface

Twisted quantum double model of topological phases

Twisted quantum double model of topological phases

Superradiant Superconductivity

Synthetic non-Abelian anyons in fractional Chern insulators and beyond

Condensed Matter - Lecture 14

Condensed Matter - Lecture 13

Condensed Matter - Lecture 12

Condensed Matter - Lecture 11

Condensed Matter - Lecture 10