Format results



PSI Lecture  Condensed Matter  Lecture 1
Aaron Szasz Lawrence Berkeley National Laboratory (LBNL)

Talk

Welcome and Opening Remarks

Roger Melko University of Waterloo

Emilie Huffman Perimeter Institute for Theoretical Physics

Shailesh Chandrasekharan Duke University

Ribhu Kaul University of Kentucky


Blackboard Talk 1  Virtual
Senthil Todadri Massachusetts Institute of Technology (MIT)  Department of Physics

Blackboard Talk 2
Senthil Todadri Massachusetts Institute of Technology (MIT)  Department of Physics


Reducing the Sign Problem with Complex Neural Networks
Johann Ostmeyer University of Liverpool

Self dual U(1) lattice field theory with a thetaterm
Christoff Gatringer FWF Austrian Science Fund

Quantum electrodynamics with massless fermions in three dimensions  Talk 1
Rajamani Narayanan Florida International University

Quantum electrodynamics with massless fermions in three dimensions  Talk 2
Rajamani Narayanan Florida International University


Talk

Microscopic aspects of insulating rareearth pyrochlore magnets
Jeffrey Rau University of Toronto

Lightning review on emergent quantum electrodynamics in quantum spin ice
YongBaek Kim University of Toronto

The importance of defects and structural flexibility in the physics of quantum spin ices
Tyrel McQueen Johns Hopkins University

Quasiparticle breakdown in the quantum pyrochlore Yb2Ti2O7 in magnetic field
Radu Coldea University of Oxford

Lobed phase diagram of single crystalline Yb2Ti2O7 in [111] magnetic field
Collin Broholm National Institute of Standards & Technology

Experimental signatures of phase competition in quantum XY pyrochlores
Alannah Hallas McMaster University




Talk



Classification on a quantum computer: Linear regression and ensemble methods
Maria Schuld University of KwaZuluNatal



Physicsinspired techniques for association rule mining
Cyril Stark ETH Zurich  Institut für Theoretische Physik

Physical approaches to the extraction of relevant information
David Schwab Northwestern University

Learning with QuantumInspired Tensor Networks
Miles Stoudenmire Flatiron Institute


Talk

Discretizing the manyelectron Schrodinger Equation
Steven White University of California, Irvine

Emergence of conformal symmetry in critical spin chains
Ashley Milsted California Institute of Technology





Unitary Networks from the Exact Renormalization of Wavefunctionals
Rob Leigh University of Illinois UrbanaChampaign

Tensor networks and Legendre transforms
Brian Swingle University of Maryland, College Park


Talk


Solitons and SpinCharge Correlations in Strongly Interacting Fermi Gases
Martin Zwierlein Massachusetts Institute of Technology (MIT)

Hierarchical growth of entangled states
John McGreevy University of California, San Diego

Scaling geometries and DC conductivities
Sera Cremonini LeHigh University

Viscous Electron Fluids: HigherThanBallistic Conduction Negative Nonlocal Resistance and Vortices
Leonid Levitov Massachusetts Institute of Technology (MIT)  Department of Physics

Universal Diffusion and the Butterfly Effect
Michael Blake Massachusetts Institute of Technology (MIT)

ParticleVortex duality and Topological Quantum Matter
Jeff Murugan Institute for Advanced Study (IAS)  School of Natural Sciences (SNS)




From Anderson Insulators to Random Singlets
Srinivas Raghu Stanford University

Quantum manybody topology of crystals and quasicrystals
Dominic Else Perimeter Institute for Theoretical Physics

PSI Lecture  Condensed Matter  Lecture 15
Aaron Szasz Lawrence Berkeley National Laboratory (LBNL)

Ultra Unification: Quantum Criticality and Deformation beyond the Standard Model
Juven Wang Harvard University
We introduce a viewpoint that the Standard Model (SM) is a lowenergy quantum vacuum arising from various neighbor Grand Unification (GUT) like vacua competition in an immense quantum phase diagram. In general, we find the SM arises near the gapless quantum critical regions between the competing neighbor vacua. Alternatively, we can also phrase this viewpoint in terms of the deformation class of quantum field theory (QFT), specified by its symmetry G and its anomaly (i.e., cobordism invariant). Seemly different QFTs of the same deformation class can be deformed to each other via quantum phase transitions. We show that GUT such as GeorgiGlashow su(5), PatiSalam su(4)×su(2)×su(2), Barr’s flipped u(5), and familiar or modified so(n) models of Spin(n) gauge group, e.g., with n = 10, 18 can all reside in an appropriate SM deformation class, labeled by Z_{16} and Z_2 nonperturbative global anomaly index. We show that Ultra Unification, which replaces some of sterile neutrinos with new exotic gapped/gapless sectors (e.g., topological or conformal field theory) or gravitational sectors with topological origins via cobordism constraints, also resides in an SM deformation class. Neighbor quantum phases near SM or their phase transitions, and neighbor gauge enhanced gapless quantum criticality naturally exhibit beyond SM phenomena. We give a new proposal on the neutrino mass origin. The talk is mainly based on: arxiv 1910.14668, 2006.16996, 2008.06499, 2012.15860, 2106.16248, 2111.10369, 2112.14765. Some of these works are in collaboration with Zheyan Wan and YiZhuang You.
Zoom Link: https://pitp.zoom.us/j/94634619703?pwd=VWlWZHNIMm1sS2owWnlhSmhZTTNvUT09

Getting the most out of your measurements: neural networks and active learning
Annabelle Bohrdt Harvard University
Recent advances in quantum simulation experiments have paved the way for a new perspective on strongly correlated quantum manybody systems. Digital as well as analog quantum simulation platforms are capable of preparing desired quantum states, and various experiments are starting to explore nonequilibrium manybody dynamics in previously inaccessible regimes in terms of system sizes and time scales. Stateofthe art quantum simulators provide singlesite resolved quantum projective measurements of the state. Depending on the platform, measurements in different local bases are possible. The question emerges which observables are best suited to study such quantum manybody systems.
In this talk, I will cover two different approaches to make the most use of these possibilities. In the first part, I will discuss the use of machine learning techniques to study the thermalization behavior of an interacting quantum system. A neural network is trained to distinguish nonequilibrium from thermal equilibrium data, and the network performance serves as a probe for the thermalization behavior of the system. We apply this method to numerically simulated data, as well experimental snapshots of ultracold atoms taken with a quantum gas microscope.
In the second part of this talk, I will present a scheme to perform adaptive quantum state tomography using active learning. Based on an initial, small set of measurements, the active learning algorithm iteratively proposes the basis configurations which will yield the maximum information gain. We apply this scheme to GHZ states of a few qubits as well as ground states of onedimensional lattice gauge theories and show an improvement in accuracy over random basis configurations.

PSI Lecture  Condensed Matter  Lecture 1
Aaron Szasz Lawrence Berkeley National Laboratory (LBNL)

Quantum Criticality: Gauge Fields and Matter
Quantum Criticality: Gauge Fields and Matter 
International Workshop on Quantum Spin Ice
International Workshop on Quantum Spin Ice


Tensor Networks for Quantum Field Theories II
Tensor Networks for Quantum Field Theories II 
Low Energy Challenges for High Energy Physicists II
Low Energy Challenges for High Energy Physicists II

Exotic compressible quantum liquids and fractons in coupled wire models
Joseph Sullivan Yale University
The coupled wire construction is a powerful method for studying exotic quantum phases of matter. In this talk I will discuss some recent work in which this technique was used to realize new types of 3D compressible quantum phases. These phases possess a U(1) charge conservation symmetry that is weakly broken by rigid string or membranelike order parameters. No local order parameter is present and the emergent quasiparticles have restricted mobility. I will discuss the unusual symmetry breaking mechanism and its connection to the compressibility. For a particular class of models I will also describe an effective low energy theory given by coupled layers MaxwellChernSimons theories.
Zoom Link: https://pitp.zoom.us/j/95372524441?pwd=UTlVTTZlSmFRK0FmVE5pTHhDRThwdz09


Quantum manybody topology of crystals and quasicrystals
Dominic Else Perimeter Institute for Theoretical Physics
When an interacting quantum manybody system is cooled down to its ground state, there can be discrete "topological invariants" that characterize the properties of such ground states. This leads to the concept of "topological phases of matter" distinguished by these topological invariants. Experimental manifestations of these topological phases of matter include the integer and fractional quantum Hall effect, as well as topological insulators.
In this talk, after a general overview of topological phases of matter, I will explain how to define topological invariants that are specific to the ground states of regular crystals, i.e. systems that are periodic in space. I will discuss the physical manifestations of the resulting "crystalline topological phases", including implications for the properties of crystalline defects such as dislocations and disclinations. Then, I will explain how these ideas can be generalized to quasicrystals, which are a different class of materials that have longrange spatial order without exact periodicity. These ideas ultimately lead to a general classification principle for crystalline and quasicrystalline topological phases of matter.

PSI Lecture  Condensed Matter  Lecture 15
Aaron Szasz Lawrence Berkeley National Laboratory (LBNL)