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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Guidelines for updating this changelog

When making changes to this project, please update the "Unreleased" section with your changes under the appropriate category:

  • Added for new features.
  • Changed for changes in existing functionality.
  • Deprecated for soon-to-be removed features.
  • Removed for now removed features.
  • Fixed for any bug fixes.
  • Performance for performance improvements.

When releasing a new version, move the "Unreleased" changes to a new version section with the release date.

Unreleased

Added

Changed

Deprecated

Removed

Fixed

Performance

0.7.0 - 2025-11-17

Added

  • Real time and finite-temperature evolution functionality for simple update
  • Correlator for mixed state InfinitePEPO
  • SUWeight to CTMRGEnv conversion (as InfinitePEPS environment)
  • Simple update for PEPO (including 3-site version)
  • Single-layer and double-layer PEPO reduced density matrix
  • spacetype method for InfinitePartitionFunction
  • Support for SU2Irrep symmetry in j1_j2_model

Changed

  • A unified interface for Trotter-based time evolution algorithms. The old su_iter, simpleupdate functions should be replaced by timestep, time_evolve respectively
  • Default fixed-point gradient algorithm changed to :eigsolver
  • BoundaryMPS methods now have their own custom transfer functions, avoiding a double conjugation and twist issues for fermions
  • physicalspace and related functions now correctly handle periodic indexing for infinite networks
  • Updated compatibility with TensorKit v0.15
  • Runic formatter

Removed

  • InfiniteWeightPEPS and mirror_antidiag
  • Support for integer space specifiers in state and environment constructors
  • Removed redefinition of tensorexpr
  • Support for dual physical spaces for non-bosonic symmetries

Fixed

  • Add unit normalization of the half and full infinite environments before the projector computation, fixing an issue with the gradient accuracy
  • Fix sporadic test timeouts when running variational optimization after simple update for the Heisenberg model by switching to a GMRES-based gradient solver
  • Rotation of iPEPO is now done correctly
  • Fix rotl90, rotr90 and rot180 for LocalOperator
  • Fix XXZ model convention
  • Fix add_physical_charge for fermionic operators
  • Fix maxiter behavior for fallback gradient linear solver
  • Fix gauge fixing in :fixed mode for non-uniform unit cells from full SVD

Performance

  • Avoid @autoopt for partition function calculations
  • Multithreaded scheduler now correctly taken into account for the reverse rules.