Monthly summary for 2026-05 (May 2026): Focused on strengthening maintainability, reliability, and QPU integration capabilities in the mqt-core stack. Key features delivered include: 1) QCO dialect architecture and code cleanliness improvements to enhance internal structure and clang-tidy compliance, supported by commit-level refinements (5c46d42b1d10d352a36df538638df234fa85deb9; 97598bfe05bd9f3fcad16c1674542958db0cd08a). 2) QDMI integration enhancements that make all QDMI devices shared libraries by default, add multi-controlled gates in the Qiskit wrapper, and streamline tests to run against real devices (commit 4fe097cfc63c122a7b93824bae1da94059070b39). Major bugs fixed and quality improvements include improved cross-platform stability and CI/test reliability during Windows runs, plus comprehensive tests/documentation updates that accompany the QDMI changes. Overall impact: increased maintainability, more robust device integration, and faster, more realistic validation of features, enabling earlier production-grade validation and smoother onboarding for users adopting QDMI and advanced gate support. Technologies/skills demonstrated: C/C++ code hygiene and clang-tidy remediation, shared library/QDMI device architecture, Qiskit wrapper enhancements, Python test orchestration with real-device execution, CI/test automation, cross-platform compatibility, documentation and changelog discipline.

April 2026 monthly summary for cda-tum/mqt-core: Delivered stability and build-system improvements through a key dependency upgrade and a build fix, enhancing reliability for downstream users and easing integration for dependent repositories.

March 2026 monthly summary for cda-tum/mqt-core: Delivered key CI/BUILD, packaging, and MLIR-readiness improvements, with focused documentation enhancements. The work emphasizes business value through more reliable CI, streamlined deployment, and groundwork for MLIR integration.

February 2026 monthly summary for cda-tum/mqt-core: Delivered modular QC IR verification infrastructure, expanded QC IR testing and verification workflows, enabling inexact float tolerance during IR verification, and drove canonicalization and performance improvements across QC/QCO pipelines. Achieved broader test coverage, improved build/test reliability, and refactored code organization to accelerate development and reduce maintenance overhead. These efforts deliver faster verification cycles, more robust transformations, and clearer engineering signals for future QC maturation.

January 2026 monthly summary for repository cda-tum/mqt-core. Delivered cross-platform CI/build improvements, platform-specific wheel builds, and targeted codebase cleanup. The work focused on increasing performance, reliability, and business value by accelerating CI, expanding wheel compatibility, and simplifying the core codebase while maintaining feature parity and test coverage.

December 2025 — cda-tum/mqt-core monthly summary. Focused on hardening QDMI device handling, stabilizing session lifecycle, and streamlining build/test workflows to deliver production-ready improvements across platforms. Business value was delivered via improved reliability, faster release cycles, and reduced maintenance overhead.

November 2025 performance highlights across cda-tum/mqt-core and tqec/tqec. Delivered hardware-ready gate support, expanded simulation capabilities, code quality improvements, and engineering productivity gains that align with product goals and external validation.

October 2025 – Focused on stabilizing installations for mqt-core by fixing SPDLOG discovery in CMake and ensuring SPDLOG config files install to a common directory, addressing post-v3.3.0 installation issues and improving user onboarding.

Month: 2025-09 — Monthly summary for cda-tum/mqt-core highlighting two main deliverables and their impact. Features delivered: MLIR Documentation Enhancement. Major bugs fixed: OpenQASM Layout Parsing Bug Fix. Overall impact: improved developer experience, tool reliability across platforms, and stronger test coverage. Technologies demonstrated: MLIR docs tooling, CMake-based local replication support, regex-based parsing, Windows compatibility fixes, and test-driven development.

In August 2025 for cda-tum/mqt-core, delivered targeted CI improvements for MLIR and aligned platform coverage with the business goal of faster, more reliable builds. Key deliverables include MLIR CI infrastructure improvements (Windows test path management, uv-based Python packaging, Ninja installation, refined LLVM cache key, and adjusted MLIR CMake paths) across commits dbf6e315581c73fab1e9c740b71de86a9f476ae3; 341a574dd4f4aeb6d49cefa9b37d9573bad71310; 5746acb9da1410c804453051fae2de15be53db6d; dropped macOS x86 CI support (macos-13): stopped testing and wheel distribution for Intel-based Macs; updated CI workflows/docs (commit 4519f0fdfbeab1c3a59d8f940bb449c879031570); and fixed a syntax error on the DD documentation page to ensure correct script execution (commit 39f4d33117bb432c1361431de4fa4425c2f97552). These changes collectively improve CI robustness, cross-platform testing efficiency, and documentation quality.

July 2025 monthly summary for cda-tum/mqt-core: modernization of the codebase and reliability improvements delivering business value through modern C++ usage, stronger CI, and better maintainability.

June 2025 monthly summary for cda-tum/mqt-core: Delivered targeted improvements to code quality, API consistency, and CI/testing infrastructure, along with fixes that reduce build risk. Key features and improvements include refactoring default bucket sizes into constants, correcting the bucket-count usage in UnaryComputeTable.clear, and adding const to UniqueTable.print to improve API correctness. In CI/CD, updated GoogleTest to v1.17.0, disabled the Read the Docs PDF build to reduce CI noise, and introduced MLIR macOS CI workflows with Codecov coverage and multi-LLVM testing. Major bugs fixed include the code scanning alert no. 601: missing header guard, contributing to more robust scanning and builds. Overall impact: improved maintainability, faster feedback loops, and broader test coverage across macOS/MLIR environments, enabling safer releases with higher confidence. Technologies demonstrated: C++, code quality practices, API design, constants-driven refactors, GoogleTest, MLIR CI, macOS CI, Codecov integration.

May 2025 focused on strengthening the MQT Core build system and configuration surfaces for MLIR integration. Key outcomes include a new CMake macro to simplify library addition and a centralized MLIR setup file that enables cross-directory visibility of MLIR variables. No major bugs fixed this month. These changes improve build consistency, release flexibility (shared vs static libraries), onboarding ease, and cross-module MLIR integration, delivering tangible business value through faster iteration and reduced maintenance overhead.

April 2025 monthly summary for cda-tum/mqt-core: Focused on stabilizing CI, modernizing build tooling, and refreshing developer-facing documentation and banners. Delivered user-facing UI improvements, a comprehensive documentation overhaul, and critical bug fixes that restored CI reliability, ensured proper compilation and linking, and improved packaging. The month also advanced dependency management and introduced modern CI/CD practices to support broader contributor onboarding and long-term maintainability.

Month: 2025-03 – A focused sprint delivering cross-repo features and stability improvements across cda-tum/mqt-core and Qiskit/qiskit, enabling greater traceability, automation, and Python/Qiskit interoperability. Notable features include verbose install command logging, license expression support via PEP 639, dependency updates and automerge enhancements, and extensive CI/testing improvements. Key bug fixes addressed Qiskit translation/layout edge cases, QASM parser include handling, and MLIR clang-tidy warnings. The updates also raised the minimum CMake version, restructured the repo for simpler maintenance, and expanded test coverage and performance optimizations. Business impact: safer dependency updates, faster release cycles, improved developer experience, and stronger interoperability with Qiskit, with measurable improvements in build reliability and traceability.

February 2025 monthly summary for cda-tum/mqt-core: delivered core API improvements, stability fixes, extensive documentation updates, and expanded testing infrastructure. Contributions spanned C++ core, OpenQASM enhancements, Python bindings, and build/tooling improvements, reinforcing reliability and developer productivity.

January 2025 (2025-01) — cda-tum/mqt-core monthly highlights focused on strengthening release readiness, code quality, and documentation while delivering meaningful features for users and developers. Key features delivered - Documentation updates and licensing notices: added OpenQASM printing dependency for docs, reworked quickstart, updated copyright, and ensured docs avoid unicode; commits include e615b115fe..., e10566b2..., 653c606501..., 5ca5391ccb... - Build and dependency management tweaks: avoided building emulated wheels for mqt-core and refined optional qiskit dependency handling; commits fdb61f008d..., 2404c85322... - Standalone dialect and dialect-related enhancements: introduced standalone dialect, copied/modified catalyst quantum dialect, dedicated BitString types for BV and Grover, and moved DAG typedefs to circuit optimizer; commits c359d2ec29..., 90eafa4f3e..., e04ab7aa403c..., ca6a9e2ae4... - Internal API and refactors: refactored register handling, modernized classic-controlled operation usage, reorganized Python bindings, and reduced idle qubit IO permutation complexity; commits 395e65ee50..., 6d88b97fab..., 0564cf61d3..., 912365e943... - QASM import improvements: refactored QASM import functionality and removed deprecated formats; commit e661759797... - Equality operator for QuantumComputation: added equality operator and tests; commit c381adb1a0d9... - Code quality, tests and hygiene: lint fixes, test organization improvements, added tests (including a failing test guiding future fixes), and cleanup; commits 63d5a113e9..., 451d064300..., 24b80e26b5..., 69cc2224cd..., 9eecb93a05..., df9434da2d..., c074bd434f... - CI/workflow improvements: updated MQT workflows to v1.6 and v1.7; commits 595993141d..., 4176e32376... - Bug fixes in context - Fixed swapped default argument names in QuantumComputation docs and corrected OpenQASM output for classic controlled operations; commits 9b4d2b62eee..., af331f00bb4a... - Fixed print for classic-controlled operation; commit 58239f32601a... - Fixed permutation handling in QASM dump; commit ca1e4c4aa83b... - Enabled fuzzy floating-point comparison for const evaluation equality checks; commit 3ebd48a11c54... - Ensured consecutive layout indices when dumping data structures; commit dca4aaecc61f... - Avoided iterator invalidation during block collection; commit cefedf2ec154... Overall impact and accomplishments - Improved release stability and developer experience via stronger testing, linting, and CI hygiene, enabling faster, safer releases. - More robust QASM handling and documentation, reducing user-facing errors and improving onboarding for new contributors. - Architectural improvements (factory patterns, references, LTO defaults) that prepare the codebase for future performance improvements and easier maintenance. Technologies and skills demonstrated - Python-centric code quality, refactoring patterns (factory functions, references), and test hygiene. - Build, packaging, and dependency management (emulated wheels, optional dependencies, uv compatibility). - OpenQASM tooling, Qiskit integration, and documentation tooling. - CI/CD modernization (MQT workflows v1.6/v1.7) and static analysis (clang-tidy, gcc warnings).

December 2024 monthly summary: Delivered cross-repo maintenance and configuration improvements to strengthen stability, compliance, and onboarding. Across cda-tum/mqt-core and cda-tum/mqt-qecc, key work targeted Qiskit 1.3 compatibility, license enforcement, and documentation, with CI and dependency-management enhancements to reduce build flakiness and accelerate safe upgrades. Major bugs addressed include Qiskit 1.3 related warnings and dependency inconsistencies in CI pipelines. The initiatives improved installation reliability, contributor onboarding, and maintainability, setting a solid foundation for upcoming releases. Technologies demonstrated include Python, Qiskit ecosystem integration, pre-commit tooling, lockfile management, dependency alignment, license compliance, and CI/CD workflow updates.

November 2024 performance highlights across the cda-tum/mqt-qecc and cda-tum/mqt-core repositories. The month focused on stabilizing QECC functionality amid dependency changes, accelerating code quality and development workflows, and advancing the DD package usability. Key outcomes include preserving QECC operations with a temporary LDPC pinning, hardening ZX diagram processing, and implementing robust development practices that improve maintainability and developer velocity while delivering practical usability enhancements for end users.

For 2024-10, focused on correctness and reliability of gate-matrix computations in cda-tum/mqt-core. Delivered a targeted bug fix to correct endianness in the DCX and XX_minus_YY gate matrices, addressed an order-of-operations issue, and updated tests to ensure robust gate multiplication and verification. The changes reduce output variance and increase simulator trustworthiness for downstream quantum algorithms, aligning with reliability and reproducibility goals.

August 2024 focused on strengthening packaging, Windows/Python visibility, and core build maintainability for mqt-core. Delivered Windows-friendly packaging with default symbol exports, shared libraries for Python packaging, multi-target builds, and explicit exports of key constants, along with a new CLI to locate CMake/include paths. Also removed the mqt-core-python bindings to simplify the build and sharpen the team's focus on core functionality. These changes improve DLL discoverability, reduce integration friction for downstream users, and lower maintenance overhead.