The Discrete Space Quantum Systems Solver (DSQSS) is a program package for solving quantum many-body problems defined on lattices. The DSQSS is based on the quantum Monte Carlo method in Feynman’s path integral representation and covers a broad range of problems using flexible input files that define arbitrary unit cells in arbitrary dimensions and arbitrary matrix elements representing the interactions among an arbitrary number of degrees of freedom. Finite temperature calculations of quantum spin and the Bose–Hubbard models can be performed by specifying parameters such as the number of dimensions, the lattice size, coupling constants, and temperature. The present paper details the use of DSQSS and presents a number of applications thereof.

Program summary

Program Title: DSQSS

CPC Library link to program files: https://doi.org/10.17632/pxngkh7krj.1

Licensing provisions: GNU General Public License version 3

Programming language: C++ and python

External routines/libraries: MPI, NumPy, SciPy

Nature of problem: Finite temperature calculation of quantum spin model and Bose–Hubbard model.

Solution method: Path-integral Monte Carlo method with the directed-loop algorithm.

中文翻译：

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DSQSS：离散空间量子系统求解器

离散空间量子系统求解器（DSQSS）是一个程序包，用于解决在晶格上定义的量子多体问题。DSQSS基于Feynman路径积分表示中的量子蒙特卡罗方法，并使用灵活的输入文件涵盖了广泛的问题，这些文件定义了任意维度的任意单位单元和代表任意数量的自由度之间相互作用的任意矩阵元素。量子自旋和Bose-Hubbard模型的有限温度计算可以通过指定诸如尺寸数量，晶格尺寸，耦合常数和温度之类的参数来执行。本文详细介绍了DSQSS的用法，并介绍了其许多应用。

计划摘要

节目名称： DSQSS

CPC库链接到程序文件： https : //doi.org/10.17632/pxngkh7krj.1

许可条款：GNU通用公共许可证版本3

编程语言： C ++和python

外部例程/库： MPI，NumPy，SciPy

问题性质：量子自旋模型和Bose-Hubbard模型的有限温度计算。

解决方法：路径积分蒙特卡罗方法与有向环算法。