# Simons Collaboration on Ultra-Quantum Matter Annual Meeting 2020

• Organized by
• Ashvin Vishwanath, Ph.D.Harvard University
• Michael Hermele, Ph.D.University of Colorado Boulder
Date & Time

Location

Gerald D. Fischbach Auditorium
160 5th Ave
New York, NY 10010 United States

View Map

Friday December 13, 2019

Invitation Only

Participation is by invitation only. All participants must register.

The Simons Collaboration on Ultra Quantum Matter (UQM) endeavors to develop the theory of highly entangled quantum matter and to work towards physical realization, particularly in synthetic matter systems. Mirroring the convergence of different communities in recent exciting developments, the UQM Annual Meeting will bring together condensed matter, high-energy, quantum information and atomic physicists to discuss advances in classifying and characterizing topological and fracton matter, in dualities and other approaches to strongly coupled gapless phases, as well as in novel platforms to realize and probe highly entangled quantum states in the laboratory.

• Agenda

#### Thursday, January 23

 8:30 AM CHECK-IN & BREAKFAST 9:30 AM Shiraz Minwalla | Matter Chern Simons Theories: Lessons from Large N 10:30 AM BREAK 11:00 AM Shamit Kachru | Black Holes at Large D and DMFT 12:00 PM Michael Levin | Computing Anomalies in SPT Edge Theories 1:00 PM PROGRAM | TBA 2:00 PM BREAK 2:30 PM Ashvin Vishwanath | Two Uses of Instantons in Solids: Probing Polarization and Characterizing Spin Liquids 3:30 PM BREAK 4:00 PM Immanuel Bloch | Quantum Matter Under the Microscope 5:00 PM DAY ONE CONCLUDES

#### Friday, January 24

 8:30 AM CHECK-IN & BREAKFAST 9:30 AM Peter Zoller | Quantum Simulations with Atoms 10:30 AM BREAK 11:00 AM Michael Hermele | Symmetries of Fracton Phases 12:00 PM LUNCH 1:00 PM Nathan Seiberg | Field Theories with Exotic Global Symmetries 2:00 PM MEETING CONCLUDES
• Public Lecture

Simons Foundation Lecture
Wednesday, January 22, 2020

Leon Balents, KITP
Tea 4:15-5:00 PM
Lecture 5:00-6:15 PM

Participation is optional; separate registration is required. Registration is expected to open on Wednesday, December 11, 2019.

https://www.simonsfoundation.org/simons-foundation-lectures/

• Abstracts

Shiraz Minwalla
Tata Institute of Fundamental Research

Matter Chern Simons Theories: Lessons from Large N

$$SU(N)_k$$ theories coupled to fundamental matter turn out to be exactly solvable in the large t’ Hooft large $$N$$ limit, $$N \to \infty$$, $$k \to \infty$$, $$N/k= \lambda$$= fixed. Over the last eight years, a great deal has been discovered about these models in this limit, including exact results for their phase diagrams, S matrices, thermal free energies, spectrum of operators and correlations functions. In this talk, Minwalla will review lessons learned from these studies and discuss open questions.

Shamit Kachru
Stanford University

Black Holes at Large D and DMFT

One can obtain non-Fermi liquids using holographic methods; a starring role is played by the emergent near-horizon AdS2 geometry of the charged black hole with higher dimensional AdS asymptotics. Here, Kachru studies these black holes and the resulting non-Fermi liquids in the limit of large dimension D and describe connections to the large D results, which come out of an a priori completely different line of development, DMFT.

Michael Levin
University of Chicago

Computing Anomalies in SPT Edge Theories

A general property of (2+1)-D symmetry-protected topological (SPT) phases is that their edges host gapless modes that are extremely robust. These edge modes provide a powerful tool for probing SPT phases, and in particular, it is believed that the low-energy theory of the edge uniquely determines the bulk SPT phase. In this talk, Levin will discuss a way to make this bulk-edge correspondence explicit; he will present a general method for identifying a (2+1)-D SPT phase from a (1+1)-D edge theory. In the language of quantum field theory, this method provides a systematic way to compute anomalies in (1+1)-D SPT edge theories with internal symmetries.

Ashvin Vishwanath
Harvard University

Two Uses of Instantons in Solids: Probing Polarization and Characterizing Spin Liquids

Polarization is a fundamental property of an insulating crystal. Vishwanath shows how test monopoles (instantons) lead to a nonperturbative definition, which can be used to calculate the polarization in strongly interacting systems. When the gauge fields are dynamical, as in theories describing quantum spin liquids, similar considerations allow us to fix the quantum numbers of monopoles. This talk will cover how this can help characterize Dirac spin liquids and possible realizations on the triangular lattice.

Immanuel Bloch
Max Planck Institute of Quantum Optics

Quantum Matter Under the Microscope

More than 30 years ago, Richard Feynman outlined his vision of a quantum simulator for carrying out complex calculations on physical problems. Today, his dream is a reality in laboratories around the world. This has become possible by using complex experimental setups of thousands of optical elements, which allow atoms to be cooled to Nanokelvin temperatures, where they almost come to rest. Recent experiments with quantum gas microscopes allow for an unprecedented view and control of such artificial quantum matter in new parameter regimes and with new probes. In our fermionic quantum gas microscope, we can detect both charge and spin degrees of freedom simultaneously, thereby gaining maximum information on the intricate interplay between the two in the paradigmatic Hubbard model. In his talk, Bloch will show how we can reveal hidden magnetic order, directly image individual magnetic polarons or probe the fractionalization of spin and charge in dynamical experiments. For the first time, we thereby have access to directly probe nonlocal ‘hidden’ correlation properties of quantum matter and to explore its real space resolved dynamical features also far from equilibrium. Bloch will also discuss our most recent experiments on realizing bilayer Fermi-Hubbard system with tunable couplings and how such a setting can be used to realize a novel 2-D spin and charge resolved detection for quantum gas microscopy experiments.

Peter Zoller
University of Innsbruck

Quantum Simulations with Atoms

Cold atoms and ions constitute not only a platform to build highly controlled quantum many-body systems, but also provide us with a unique toolbox to develop and implement novel measurement protocols for many-body observables. In this talk, Zoller will first discuss novel protocols based on randomized measurements, where statistical correlations between measurements probabilities allow us to access quantities from entanglement (Renyi) entropies to out-of-time ordered correlation function and topological invariants and provide us with protocols to perform cross-platform validation of quantum simulators. Furthermore, Zoller will discuss protocols allowing (quantum non-demolition) measurement of the many-body Hamiltonian (i.e., single-shot measurements of `the energy’ of a many-body system) and applications. Finally, he provides an outlook on how quantum simulators can be interfaced with small-scale quantum devices, providing quantum memory and a minimal set of quantum operations to analyze many-body quantum states and dynamics of quantum simulators.

Michael Hermele
University of Colorado, Boulder

Symmetries of Fracton Phases

Fracton phases are a new class of quantum phases of matter that are of interest in part because they lie beyond existing theoretical frameworks. In particular, fracton phases present fundamental challenges to common assumptions about the relationship between phases of matter and quantum field theories. In this talk, Hermele will show how carefully considering the symmetries of fracton phases — including generalized global symmetries — can help shed light on some of their mysteries. He will discuss both symmetries that emerge in the infrared and symmetries that underpin mechanisms where condensation of certain extended objects leads to a fracton phase.

Nathan Seiberg
Institute for Advanced Study

Field Theories with Exotic Global Symmetries

Seiberg will review the analysis of vector global symmetries and will extend it to other exotic symmetries. He will demonstrate the general discussion using known models in the literature.

• Travel

Air and Train

Groups A & B
The foundation will arrange and pay for all air and train travel to the conference for those in Groups A and B. Please provide your travel specifications by clicking the registration link above. If you are unsure of your group, please refer to your invitation sent via email.

Group C
Individuals in Group C will not receive financial support. Please register at the link above so we can capture your dietary requirements. If you are unsure of your group, please refer to your invitation sent via email.

Personal Car
For participants driving to Manhattan, The James New York hotel offers valet parking. Please note there are no in-and-out privileges when using the hotel’s garage, therefore it is encouraged that participants walk or take public transportation to the Simons Foundation.

• Hotel

Participants in Groups A & B who require accommodations are hosted by the foundation for a maximum of three nights at The James New York hotel. Hotel nights must directly correspond to the dates of the meeting. Any additional nights are at the attendee’s own expense.

The James New York
22 E 29th St
New York, NY 10016

To arrange accommodations, please register here.

For driving directions to The James New York, please click here.

• Contacts

Travel and Hotel Assistance
Elise Volpe
CrowdControl Events
simons@crowdcontrol.io
(877) 636-0170

Registration Issues and General Meeting Assistance
Meghan Fazzi
Manager, Events and Administration, MPS
mfazzi@simonsfoundation.org
(212) 524-6080

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