Moorea Workshop

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Simulation of Quantum Lattice Models: state of the art algorithms and high performance computing

The simulation of interacting quantum systems has always been one of the grand challenges for computational physics, with important questions such as:

  • what is the mechanism behind superconductivity in the cuprate high-temperature superconductors? Why can we achieve superconductivity at about 160 K but currently not at room temperature?
  • what is the phase diagram of strongly correlated materials? How can we understand the complicated structural phases of materials close to a Mott transitions, such as transition metal oxides and actinides?
  • do exotic phases such as "supersolids" -- which are crystalline solids but at the same time show frictionless flow like a perfect liquid -- exist?
  • are there materials or realistic models exhibiting nonabelian anyonic excitations, which could be used to implement error-free and robust topological quantum computers that will not suffer from decoherence and will not require error correction schemes?

The simulations of models pertaining to these questions has always been one of the grand challenges of supercomputing but has rarely taken center stage in the past decades, compared to other fields like protein folding or climate modeling, since the computational effort required for realistic simulations of strongly interacting quantum systems has exceeded that of past supercomputers and only simplified models could be studied.

Significant algorithmic developments over the past decade combined with petaflop-scale supercomputers will soon open the way to realistic large-scale simulations of these topics, but scaling the algorithms to tens of thousands of processor cores will require a concerted research and development effort.

We thus plan to hold an international workshop, brining together the experts on development and implementation of state-of-the-art algorithms for the simulation of correlated quantum systems. The goals are to

  • review the application areas and identify a number of key "demonstration problems" that can be tackled on petaflop-scale computers.
  • identify the best algorithms currently known and to prepare a document summarizing the state-of-the art in the various simulation methods. The purpose of this document will be both to guide our own further developments and to provide guidelines to other groups entering the field.
  • review the challenges posed by scaling these simulation algorithms to petaflop computers and to develop ideas for better scalable algorithms.
  • discuss implementation and optimization issues for these algorithms on petaflop-sale supercomputers, and initiate a project for a joint code-base for core common subroutines.
  • initiate collaborative development of simulation algorithms for the "demonstration problems"


Simulation of lattice models: state of the art algorithms and high performance computing

The conference will ....


  • Algorithms
    • Classical and quantum Monte Carlo algorithms
    • Parallel tempering and generalized ensembles
    • Density Matrix Renormalization Group methods
    • Diagonalization methods
    • Series expansions
    • DMFT methods
  • High Performance Computing
    • Parallelization on massively parallel machines
    • Handling of large data sets
  • Data handling
    • Formats
    • Storage and Archiving
    • Data analysis
    • Visualization
  • Education
  • Outreach


The possibility to hold the workshop at the Gump Station of UC Berkeley has been confirmed.


Rationale for the location

Next year we will have ALPS participants in

  • Europe
  • China
  • Japan
  • Australia
  • USA (California and new York)

We thus want to have workshops not only in Europe but also sometimes in locations more convenient for for the Pacific rim participants. Moorea is a convenient location with many convenient flights to the nearby Papeete airport.


Flights are available

  • nonstop from
    • Los Angeles (8 hours) on TN, AF, NZ
    • New York (12 hours) on TN
    • Sydney (8 hours) on TN
    • Tokyo (9 hours) on TN, JL
  • direct connections with a refulelling stop from
    • Frankfurt (via Los Angeles, 22 hours) on NZ
    • Paris (via Los Angeles, 22 hours) on TN,AF
    • Santiago (via Easter Island, 12 hours) on LN
  • connections with one change of airplane from
    • Brisbane
    • Hong Kong
    • Sao Paulo
    • Zurich

From Papeete you can either take a flight (10 minutes), high speed cat (30 minutes) or normal ferry (1 hour) to Moorea


June 9 - 14, 2008


  • Matthias Troyer
  • Helmut G. Katzgraber
  • Peter Drummond


Please add other potentially interested people both from ALPS and outside. (*) unconfirmed

ALPS people

  • Matthias Troyer
  • Synge Todo
  • Simon Trebst
  • Adrian Feiguin
  • Lukas Gamper
  • Lode Pollet
  • Philippe Corboz
  • Emanuel Gull
  • Uli Schoellwoeck
  • Reinhard Noack
  • Andreas Honecker
  • Fabricio Albuquerque
  • Andreas Laeuchli
  • Ian McCulloch
  • Salvatore Manmana (*)
  • Munehisa Matsumoto (*)

Other participants

  • Helmut Katzgraber
  • Michael Mascagni (pending support)
  • Wesley Petersen
  • Peter Drummond
  • Guifre Vidal
  • Joel Corney (*)
  • Naoki Kawashima (*)
  • Hiro Tsunetsugu (*)
  • Massimo Boninsegni (*)
  • Peter Young (*)
  • Florent Krzakala (*)
  • Alexander Hartmann (*)
  • Roger Melko (*)
  • Jeongnim Kim (*)
  • Thomas Maier (*)
  • Brigitte Surer (*)
  • Kevin Beach (*)
  • Nikolay Prokof'ev (*)
  • Anders Sandvik (*)
  • Werner Krauth (*)
  • Andre-Marie Tremblay (*)
  • Gabi Kotliar (*)
  • Mark Jarrell (*)
  • George Batrouni (*)
  • Olivier Parcollet (*)
  • Erik Jeckelmann (*?)
  • Thomas Lippert (*)
  • David Ceperley (*)
  • Bill Lester (*)
  • Birgitta Whaley (*)
  • Erik Koch + Eva Pavarini (*)
  • Mark Jarrell (*)
  • Ors Legeza (*)
  • Olav Syljuasen (*)