cda-tum/mqt-core
May 2025 – May 2026
12 Months active
Languages Used
C++CMakeMLIRMarkdownPythonLLVM IR
Technical Skills
Algorithm DesignC++ DevelopmentQuantum ComputingSoftware RefactoringUnit TestingC++
Matthias Reumann
PROFILE
Matthias Reumann
Over twelve months, contributed to the cda-tum/mqt-core repository by designing and implementing advanced features for quantum circuit compilation and optimization. Leveraging C++, MLIR, and Python, developed scalable algorithms for decision diagram approximation, quantum state generation, and memory management, including a mark-and-sweep garbage collector. Enhanced circuit routing and placement with new mapping strategies, robust traversal utilities, and architecture simplifications, while refactoring core APIs for maintainability and performance. Integrated comprehensive unit testing, documentation, and CI/CD improvements to ensure code quality. The work enabled more efficient quantum-classical program transpilation, improved analysis capabilities, and established a modular foundation for future compiler enhancements.
Overall Statistics
Feature vs Bugs
74%Features
Repository Contributions
76Total
Bugs
10
Commits
76
Features
29
Lines of code
179,095
Activity Months12
Your Network
152 peopleWork History
May 2026
2 Commits • 2 Features
May 1, 2026May 2026 (2026-05) – cda-tum/mqt-core: Delivered key feature improvements and architecture simplifications with strong testing, documentation, and migration updates. Focused on business value and developer experience. No high-severity bugs reported this month.
2 Commits • 2 Features
May 1, 2026May 2026 (2026-05) – cda-tum/mqt-core: Delivered key feature improvements and architecture simplifications with strong testing, documentation, and migration updates. Focused on business value and developer experience. No high-severity bugs reported this month.
May 2026
April 2026
41 Commits • 13 Features
Apr 1, 2026April 2026 monthly summary focusing on key accomplishments in cda-tum/mqt-core. Delivered API and core interface enhancements to improve tensor workflows and API usability; added graph walking utilities and a program-graph driver; refactored the compiler pipeline and layout management for better performance and maintainability; implemented runtime and algorithmic optimizations; and completed documentation and lint improvements to ensure code quality and reliability. These efforts reduce integration costs, increase runtime efficiency, and strengthen the project's architecture for future work.
April 2026
41 Commits • 13 Features
Apr 1, 2026April 2026 monthly summary focusing on key accomplishments in cda-tum/mqt-core. Delivered API and core interface enhancements to improve tensor workflows and API usability; added graph walking utilities and a program-graph driver; refactored the compiler pipeline and layout management for better performance and maintainability; implemented runtime and algorithmic optimizations; and completed documentation and lint improvements to ensure code quality and reliability. These efforts reduce integration costs, increase runtime efficiency, and strengthen the project's architecture for future work.
March 2026
11 Commits • 2 Features
Mar 1, 2026March 2026 performance highlights for cda-tum/mqt-core: delivered a robust upgrade to the Quantum Circuit Mapping workflow and restructured the QCO codebase for maintainability. The work shipped high-impact mapping improvements, enhanced robustness, and comprehensive documentation, delivering business value through higher-quality circuit layouts, faster iteration, and clearer architecture.
11 Commits • 2 Features
Mar 1, 2026March 2026 performance highlights for cda-tum/mqt-core: delivered a robust upgrade to the Quantum Circuit Mapping workflow and restructured the QCO codebase for maintainability. The work shipped high-impact mapping improvements, enhanced robustness, and comprehensive documentation, delivering business value through higher-quality circuit layouts, faster iteration, and clearer architecture.
March 2026
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026: Delivered a core feature to improve def-use chain management in the QCO dialect by introducing WireIterator for traversing the def-use chain of qubit wires in the QCO IR. This builds a reliable foundation for operation tracking, debugging, and future optimization passes. Focused work in the cda-tum/mqt-core repository with a well-scoped change committed to enable downstream improvements.
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026: Delivered a core feature to improve def-use chain management in the QCO dialect by introducing WireIterator for traversing the def-use chain of qubit wires in the QCO IR. This builds a reliable foundation for operation tracking, debugging, and future optimization passes. Focused work in the cda-tum/mqt-core repository with a well-scoped change committed to enable downstream improvements.
December 2025
4 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for cda-tum/mqt-core: Delivered unitized routing architecture for quantum-classical programs, introduced two traversal modes (SequentialUnit and LayeredUnit), added CRTP interfaces for maintainability, and refined the NaiveRoutingPass insertion to improve transpilation; fixed an off-by-one bug in shortestSWAPsBetween; updated tests, docs, and changelog to reflect these changes; overall impact: more reliable routing, clearer extensibility for future routing methods, and improved SWAP accounting in hardware mappings.
4 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for cda-tum/mqt-core: Delivered unitized routing architecture for quantum-classical programs, introduced two traversal modes (SequentialUnit and LayeredUnit), added CRTP interfaces for maintainability, and refined the NaiveRoutingPass insertion to improve transpilation; fixed an off-by-one bug in shortestSWAPsBetween; updated tests, docs, and changelog to reflect these changes; overall impact: more reliable routing, clearer extensibility for future routing methods, and improved SWAP accounting in hardware mappings.
December 2025
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary for cda-tum/mqt-core: Key feature delivery focused on enabling robust analysis of quantum circuits via a new bidirectional def-use traversal, introduced by the WireIterator. No major bugs reported this month. Overall impact includes stronger circuit analysis, safer transformations, and groundwork for future optimizations. Technologies/skills demonstrated include object-oriented design, traversal algorithms, and integration with existing mqt-core infrastructure.
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary for cda-tum/mqt-core: Key feature delivery focused on enabling robust analysis of quantum circuits via a new bidirectional def-use traversal, introduced by the WireIterator. No major bugs reported this month. Overall impact includes stronger circuit analysis, safer transformations, and groundwork for future optimizations. Technologies/skills demonstrated include object-oriented design, traversal algorithms, and integration with existing mqt-core infrastructure.
October 2025
3 Commits • 2 Features
Oct 1, 20252025-10 focused on delivering high-impact routing improvements for cda-tum/mqt-core. Key outcomes include MLIR-based QMAP routing with Layerizer/Planner, memory-efficient ThinLayout, and an A*-routing refactor; plus a new --arch option for MLIR routing to target IBM Falcon with propagated settings and updated tests. These changes yield faster, more memory-efficient circuit mapping and broader architectural support, directly enabling larger designs and improved operational efficiency.
3 Commits • 2 Features
Oct 1, 20252025-10 focused on delivering high-impact routing improvements for cda-tum/mqt-core. Key outcomes include MLIR-based QMAP routing with Layerizer/Planner, memory-efficient ThinLayout, and an A*-routing refactor; plus a new --arch option for MLIR routing to target IBM Falcon with propagated settings and updated tests. These changes yield faster, more memory-efficient circuit mapping and broader architectural support, directly enabling larger designs and improved operational efficiency.
October 2025
September 2025
3 Commits • 1 Features
Sep 1, 2025September 2025: cda-tum/mqt-core — Delivered primary MLIR quantum circuit routing and placement enhancements, including a naive mapping algorithm, robustness improvements in the routing pass via standardized entry-point checks, and a dedicated PlacementPass that splits routing into placement and routing steps, while supporting static qubit replacement, initial placement generation, and extended control-flow constructs. Also completed refactors of Common.h and Layout.h for better organization.
September 2025
3 Commits • 1 Features
Sep 1, 2025September 2025: cda-tum/mqt-core — Delivered primary MLIR quantum circuit routing and placement enhancements, including a naive mapping algorithm, robustness improvements in the routing pass via standardized entry-point checks, and a dedicated PlacementPass that splits routing into placement and routing steps, while supporting static qubit replacement, initial placement generation, and extended control-flow constructs. Also completed refactors of Common.h and Layout.h for better organization.
August 2025
3 Commits • 2 Features
Aug 1, 2025August 2025 (cda-tum/mqt-core): Key feature deliveries include static qubit addressing across dialects with MQTDyn renamed to MQTRef and a new Qubit operation in mqtopt; a major refactor introducing StatefulOpConversionPattern to centralize lowering state and reduce boilerplate. Tests and docs updated to reflect static addressing and static references. Business value: improved cross-dialect interoperability, more maintainable lowering code, and a stronger foundation for future optimizations. No major bugs fixed this month.
3 Commits • 2 Features
Aug 1, 2025August 2025 (cda-tum/mqt-core): Key feature deliveries include static qubit addressing across dialects with MQTDyn renamed to MQTRef and a new Qubit operation in mqtopt; a major refactor introducing StatefulOpConversionPattern to centralize lowering state and reduce boilerplate. Tests and docs updated to reflect static addressing and static references. Business value: improved cross-dialect interoperability, more maintainable lowering code, and a stronger foundation for future optimizations. No major bugs fixed this month.
August 2025
July 2025
1 Commits • 1 Features
Jul 1, 2025July 2025 | cda-tum/mqt-core 1) Key features delivered - Decision Diagram Garbage Collector Overhaul (Mark-and-Sweep): migrated GC from reference counting to mark-and-sweep for the decision diagram package, improving memory management and reclaiming nodes and complex numbers more efficiently. Commit 121df7f8207b7df793d56776e83cc8f3f59b6f84; message: "♻️ Switch from reference counting to mark-and-sweep garbage collection in decision diagram package (#1020)". 2) Major bugs fixed - None reported this month; primary focus was architectural memory-management improvement rather than bug fixes. 3) Overall impact and accomplishments - Improved memory reclamation and stability for large decision-diagram workloads, enabling higher throughput and reduced memory pressure. This work lays groundwork for further GC tuning and performance gains across the mqt-core stack. 4) Technologies/skills demonstrated - Garbage collection strategies (mark-and-sweep), memory-management optimization, refactoring for GC architecture, traceability via commit references, proficiency with the cda-tum/mqt-core codebase.
July 2025
1 Commits • 1 Features
Jul 1, 2025July 2025 | cda-tum/mqt-core 1) Key features delivered - Decision Diagram Garbage Collector Overhaul (Mark-and-Sweep): migrated GC from reference counting to mark-and-sweep for the decision diagram package, improving memory management and reclaiming nodes and complex numbers more efficiently. Commit 121df7f8207b7df793d56776e83cc8f3f59b6f84; message: "♻️ Switch from reference counting to mark-and-sweep garbage collection in decision diagram package (#1020)". 2) Major bugs fixed - None reported this month; primary focus was architectural memory-management improvement rather than bug fixes. 3) Overall impact and accomplishments - Improved memory reclamation and stability for large decision-diagram workloads, enabling higher throughput and reduced memory pressure. This work lays groundwork for further GC tuning and performance gains across the mqt-core stack. 4) Technologies/skills demonstrated - Garbage collection strategies (mark-and-sweep), memory-management optimization, refactoring for GC architecture, traceability via commit references, proficiency with the cda-tum/mqt-core codebase.
June 2025
5 Commits • 2 Features
Jun 1, 2025During June 2025, delivered key features enabling scalable quantum state modeling and improved testing. Introduced Random vector DD state generation with centralized StateGeneration API, supporting exponentially large states, configurable wiring strategies, and reproducible seeding. Refactored state creation into dd::StateGeneration for maintainability. Expanded QA with a comprehensive MQTDyn MLIR dialect test suite covering allocation, extraction, measurement, and gate support. Fixed numerical inaccuracies in ThreeQubitRemoveUnconnected test and added a controlled-RY gate to better simulate complex scenarios. Overall impact: increased reliability and scalability of state generation, stronger validation of MLIR dialect, and lower risk for future changes. Tech stack: C++, MLIR, unit testing, reproducible seeding, and gate implementation.
5 Commits • 2 Features
Jun 1, 2025During June 2025, delivered key features enabling scalable quantum state modeling and improved testing. Introduced Random vector DD state generation with centralized StateGeneration API, supporting exponentially large states, configurable wiring strategies, and reproducible seeding. Refactored state creation into dd::StateGeneration for maintainability. Expanded QA with a comprehensive MQTDyn MLIR dialect test suite covering allocation, extraction, measurement, and gate support. Fixed numerical inaccuracies in ThreeQubitRemoveUnconnected test and added a controlled-RY gate to better simulate complex scenarios. Overall impact: increased reliability and scalability of state generation, stronger validation of MLIR dialect, and lower risk for future changes. Tech stack: C++, MLIR, unit testing, reproducible seeding, and gate implementation.
June 2025
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary for the cda-tum/mqt-core repository focused on delivering a high-value feature with solid validation and scalable design. Executive summary: Delivered a new Decision Diagram Approximation feature by migrating and refactoring the DDSim functionality, establishing a foundation for accurate, scalable decision diagram analytics in the core MQT pipeline. This work includes new architecture for the approximation logic, supporting header and source files, and comprehensive unit tests to validate fidelity across multiple scenarios.
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary for the cda-tum/mqt-core repository focused on delivering a high-value feature with solid validation and scalable design. Executive summary: Delivered a new Decision Diagram Approximation feature by migrating and refactoring the DDSim functionality, establishing a foundation for accurate, scalable decision diagram analytics in the core MQT pipeline. This work includes new architecture for the approximation logic, supporting header and source files, and comprehensive unit tests to validate fidelity across multiple scenarios.
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Quality Metrics
Correctness90.6%
Maintainability87.8%
Architecture88.2%
Performance85.2%
AI Usage30.0%
Skills & Technologies
Programming Languages
C++CMakeLLVM IRMLIRMarkdownPython
Technical Skills
API DevelopmentAlgorithm DesignAlgorithm ImplementationAlgorithm OptimizationAlgorithm designAttribute HandlingC++C++ DevelopmentC++ developmentC++ programmingCI/CDCMakeCode OrganizationCode RefactoringCode linting
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