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QSpace - An open-source tensor library for Abelian and non-Abelian symmetries

Journal Article · · SciPost Physics Codebases
 [1]
  1. Brookhaven National Laboratory (BNL), Upton, NY (United States)
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This is the documentation for the tensor library QSpace (v4.0), a toolbox to exploit ‘quan tum symmetry spaces’ in tensor network states in the quantum many-body context. QSpace permits arbitrary combinations of symmetries including the abelian symmetries $$\mathbb{Z}_n$$ and U(1), as well as all non-abelian symmetries based on the semisimple classical Lie algebras: An, Bn, Cn, and Dn, or respectively, the special unitary group SU(n), the odd orthogonal group SO(2n+1), the symplectic group Sp(2n), and the even orthogonal group SO(2n). The code (C++ embedded via the MEX interface into Matlab) is available open source as of QSpace v4.0 on bitbucket under the Apache 2.0 license. QSpace is designed as a bottom-up approach for non-abelian symmetries. It starts from the defining representation and the respective Lie algebra. By explicitly comput ing and tabulating generalized Clebsch-Gordan coefficient tensors, QSpace is versatile in the type of operations that it can perform across all symmetries. At the level of an ap plication, much of the symmetry-related details are hidden within the QSpace C++ core libraries. Hence when developing tensor network algorithms with QSpace, these can be coded (nearly) as if there are no symmetries at all, despite being able to fully exploit general non-abelian symmetries.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); German Research Foundation (DFG)
Grant/Contract Number:
SC0012704
OSTI ID:
2500297
Report Number(s):
BNL--226467-2025-JAAM
Journal Information:
SciPost Physics Codebases, Journal Name: SciPost Physics Codebases Vol. 40; ISSN 2949-804X
Publisher:
SciPost FoundationCopyright Statement
Country of Publication:
United States
Language:
English

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