DSQSS (Discrete Space Quantum Systems Solver) is a software package for calculating expectation values of several observables of quantum lattice systems in finite temperature. DSQSS implements the path-integral Monte Carlo method with the directed loop algorithm.

• src
  • source codes of the main programs, DSQSS/DLA and DSQSS/PMWA
• tool
  • utility tools (input file generators)
• sample
  • examples of application
• test
  • test suite
• doc
  • document
• config
  • configuration files used in CMake

• C++ Compiler
• CMake >=2.8.12
• Python >=3.6
  • numpy
  • scipy
  • toml
  • typing_extensions (if Python < 3.8)

rm -rf build mkdir build cd build cmake ../ make

To change compiler, add -DCMAKE_CXX_COMPILER like

cmake ../ -DCMAKE_CXX_COMPILER=`which icpc`

For Intel compiler, DSQSS offers another option -DCONFIG=intel for setting compiler and adding compiler options

cmake ../ -DCONFIG=intel

You can find executable files in build/src/dla, build/tool and build/src/pmwa/.

Sphinx and sphinxcontrib-spelling are required. LaTeX is required for PDF format.

# in the build directory, cmake -DDocument=ON ../ make doc

# in the build directory, ctest

When some tests failed, you can check output of these tests by following:

# in the build directory, ctest -V -R "test name"

Test names can be specified by the regular expression.

The path to install is specified by -DCMAKE_INSTALL_PREFIX as the following,

# in the build directory, cmake -DCMAKE_INSTALL_PREFIX=${INSTALL_DIR} ../ make install

After this process, executable files such as dla are installed to ${INSTALL_DIR}/bin, a configuration file dsqssvars-${DSQSS_VERSION}.sh to ${INSTALL_DIR}/share/dsqss/, sample files to ${INSTALL_DIR}/share/dsqss/dsqss-${DSQSS_VERSION}/sample, and documents (if built) to ${INSTALL_DIR}/share/dsqss/dsqss-${DSQSS_VERSION}/doc.

source ${INSTALL_DIR}/share/dsqss/dsqssvars-${DSQSS_VERSION}.sh cd sample/dla/01_spindimer dla_pre std.toml dla param.in cat sample.log | grep ene

For details, see manual page.

We would appreciate if you cite the following article in your research with DSQSS, Y. Motoyama, K. Yoshimi, A. Masaki-Kato, T. Kato, and N. Kawashima, Comput. Phys. Commun. 264, 107944 (2021).

The preprint is arXiv:2007.11329.

DSQSS is distributed under the GNU GPL v3.

• Boost C++ library is redistributed under the Boost software license.
• Plog is redistributed under the Mozilla Public License 2.0
• FindPythonModule.cmake is redistributed under the OSI approved BSD license.

DSQSS v1.2 and v2.0 are developed under the support of "Project for advancement of software usability in materials science" in fiscal year 2018 by The Institute for Solid State Physics, The University of Tokyo.