Quantum Simulation of Strong Interactions (QuaSI) Workshop 1 : Theoretical Strategies for Gauge Theories

Organizers: Christian Bauer (LBNL), Zohreh Davoudi (UMD), Natalie Klco (Caltech) and Erez Zohar (Jerusalem).

The discretized formulation of quantum field theories has provided a rigorous framework for ab initio numerical studies of gauge theories with controlled systematic uncertainties, supporting experimental efforts in nuclear and high-energy physics. However, growing multiplicities of the final states in highly energetic processes, accounting for exponential growth of dynamical configuration spaces, as well as real-time evolution of such configurations necessary in computing time-dependent observables, present fundamental limitations to our current methods. Consequently, a range of phenomena relevant to equilibrium and out-of-equilibrium phases of strongly interacting systems is computationally inaccessible. To extend beyond capabilities of the current lattice gauge theory program, radically different non-perturbative approaches may be required. One approach, proposed in the 1980’s by Feynman and others, is the introduction of quantum degrees of freedom directly into the computational framework—an approach that is showing potential with first examples of simulations having recently become experimentally feasible.

Fortuitously in light of the widely varying characteristics of promising quantum architectures, a similarly wide range of strategies for the quantum simulation of gauge theories has been developed in recent decades. The goal of this QuaSI workshop is to holistically and closely examine these complementary strategies as a community—concretely discussing their mechanisms for representing gauge fields with quantum degrees of freedom, their resulting quantum simulation strategies (state preparation, evolution, and measurements), and hence identifying their strengths and weaknesses for near-term and long-term performance.

Throughout the week, individuals and collaborators will host “QuaSI talks”—interactive presentations or discussion sessions. This QuaSI workshop serves as a beginning for an engaged network of physicists invested in the quantum simulation of strong interactions and will lay the groundwork for future interactions on topics ranging from theoretical developments to practical or conceivable quantum-hardware implementations.

What is a QuaSI Workshop?

“A QuaSI workshop is an avenue for cultivating new ideas and strategies to be built upon existing understandings and developments in a field that moves and expands rapidly. A QuaSI workshop is not a place for showcasing general ideas and flashing results, but is an environment for learning collectively and for investigating existing ideas in depth and at length. A QuaSI workshop is a ‘school’ for researchers at the forefront of developments and, at the same time, is a ‘workshop’ that examines and generates new ideas/methods through a focused effort. Interactions are at the core of a QuaSI workshop and our participants love talks and Q&A sessions using a (black)whiteboard (virtual or physical)!”

“A QuaSI workshop is a way to connect people from various backgrounds working broadly on simulation of the strong interaction on quantum computers. The goal of the workshop is not to advertise the latest work of individual groups, but rather to teach others in the field about the various approaches taken. Talks in the workshop should be more like mini-lectures than traditional conference presentations, with the idea that attendees can follow all steps of the lecture and learn important concepts that underly a given formalism. Active participation and questions are strongly encouraged during the talks.”

“The Quasi Workshop is a community-oriented workshop, in which we all join forces together. We teach and learn from each other, and become familiar with one another, with our works, our perspectives, and our future goals. This workshop is not about advertising our works or competing with each other, but rather on strengthening the connections in our field, both between people and research topics, building a synergetic community, eager to study, research and advance together.”

“A QuaSI workshop aims to create an inviting and focused environment for researchers within a field to develop together a foundation of concrete understanding and perspective through which future discoveries can be quickly contextualized and integrated. Guided by scientific understanding, a QuaSI workshop is designed to provide interactive and collaborative opportunities for deeply appreciating the ideas presented in our diverse and extensive literature and for nurturing community coherence going forward.”

Hourly Schedule

Tuesday, April 6

8.50am - 8.55am
Welcome to IQuS
Silas Beane, Martin Savage and David Kaplan
8.55am - 9.00am
Quasi Organizer Welcome
Christian Bauer, Zohreh Davoudi, Natalie Klco and Erez Zohar
9.00am - 9.40am
The Gauss law and its application to the elimination of fields and replacing fermions by hard core bosons
Erez Zohar (Hebrew University of Jerusalem)
9.40am - 10.20am
Prepotentials, Schwinger bosons, loop-string-hadron formulations
Indrakshi Raychowdhury (University of Maryland)
10.20am - 11.00am
Gauss law oracles and gauge invariant time evolution
Jesse Stryker (University of Maryland)

Wednesday, April 7

9.00am - 9.40am
Analog simulation with fundamental symmetries
Benni Reznik (Tel Aviv University)
9.40am - 10.20am
Dual formulation of lattice gauge theory Hamiltonians using plaquette variables
Julian Bender (Max-Planck-Institute of Quantum Optics, Garching)
10.20am - 11.00am
Tensor networks of lattice gauge theories for the quantum-simulation era
Mari Carmen Banuls (Max-Planck-Institute of Quantum Optics, Garching)

Thursday, April 8

9.00am - 9.40am
Link models and qubit regularization
‪Shailesh Chandrasekharan (Duke University)‬
9.40am - 10.20am
Gauge invariance violation and emergent gauge symmetries
Philipp Hauke (University of Trento)
10.20am - 11.00am
Gauge invariance by dynamical decoupling and the Zeno effect
Valentin Kasper (ICFO – The Institute of Photonic Sciences, Barcelona)

Friday, April 9

9.00am - 9.40am
Group element basis and digital plaquette interactions
Hank Lamm (Fermi National Accelerator Laboratory)
9.40am - 10.20am
Local irreps for non-Abelian theories
Natalie Klco (California Institute of Technology)
10.20am - 11.00am
Orbifold lattices for Hamiltonian simulation
Masanori Hanada (University of Surrey, UK)

Monday, April 12

9.00am - 9.40am
Simulation strategies for scalar field theory
Niklas Mueller (University of Maryland)
9.40am - 10.20am
Simulation strategies for models of QCD and effective field theories
Christian Bauer (Lawrence Berkeley National Laboratory) and Enrique Rico (University of Basque Country)
10.20am - 11.00am
Perspectives by John Kogut and open discussion
Christian Bauer, Zohreh Davoudi, Natalie Klco, John Kogut and Erez Zohar
Sold out!


Apr 06 - 12 2021


US West Coast time Zone
8:55 am - 11:00 am


Cyber Space


Cyber Space
QuaSI. Team - Christian Bauer, Zohreh Davoudi, Natalie Klco and Erez Zohar


QuaSI. Team - Christian Bauer, Zohreh Davoudi, Natalie Klco and Erez Zohar