Qiskit/qiskit
Mar 2026 – May 2026
2 Months active
Languages Used
RustC
Technical Skills
C programmingDAG manipulationQuantum computingTranspiler developmentRust programmingquantum computing
Bruno Caballero
PROFILE
Bruno Caballero
Worked on the Qiskit/qiskit repository to deliver DAG-based transpiler optimizations in the C API, focusing on direct manipulation of directed acyclic graphs to reduce circuit conversion overhead and improve quantum circuit transpilation performance. Developed and integrated multiple DAG-based transpiler passes, including a BasisTranslator variant, enabling more efficient and scalable handling of large quantum workloads. Leveraged C and Rust programming skills to implement these features, emphasizing maintainability and code quality through formatting and comprehensive test updates. The work enhanced the efficiency of custom transpilation pipelines, improved API ergonomics, and laid the foundation for broader adoption of DAG-based techniques.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
2Total
Bugs
0
Commits
2
Features
2
Lines of code
1,412
Activity Months2
Your Network
84 peopleWork History
May 2026
1 Commits • 1 Features
May 1, 2026May 2026 monthly summary for Qiskit/qiskit focused on delivering a performance-oriented transpilation enhancement in the C API. Delivered a DAG-based BasisTranslator variant that enables direct manipulation of DAG circuits, removing the need for conversion overhead and reducing transpilation time for larger circuits. The work is captured in commit 9eb2467be0784a3a8b486d8b32dddad274901643, which adds the DAG-based variant of the BasisTranslator transpiler pass in the C API, includes a missing export_fn, and updates release notes. Minor accompanying changes included an export_fn fix and release notes corrections. Key achievements for the month: - Implemented and delivered a DAG-based BasisTranslator variant for the C API transpiler, enabling direct DAG circuit manipulation and eliminating an intermediate conversion step. - Exposed the new transpiler pass via the C API (export_fn added) and updated release notes for user guidance. - Bug/defect activity: no major defects reported; included minor fixes to export_fn exposure and release notes. Overall impact and accomplishments: - Technical: improved transpilation performance and efficiency for Qiskit circuits transpiled through the C API, reducing overhead and enabling scalable handling of larger DAGs. - Business value: faster transpilation improves developer workflows, reduces compute time in CI/CD and local builds, and enhances API ergonomics for C API users. Technologies/skills demonstrated: - C API integration for transpilation passes - DAG-based circuit manipulation techniques - API exports (export_fn) and release notes discipline - Focus on performance optimization and maintainability
1 Commits • 1 Features
May 1, 2026May 2026 monthly summary for Qiskit/qiskit focused on delivering a performance-oriented transpilation enhancement in the C API. Delivered a DAG-based BasisTranslator variant that enables direct manipulation of DAG circuits, removing the need for conversion overhead and reducing transpilation time for larger circuits. The work is captured in commit 9eb2467be0784a3a8b486d8b32dddad274901643, which adds the DAG-based variant of the BasisTranslator transpiler pass in the C API, includes a missing export_fn, and updates release notes. Minor accompanying changes included an export_fn fix and release notes corrections. Key achievements for the month: - Implemented and delivered a DAG-based BasisTranslator variant for the C API transpiler, enabling direct DAG circuit manipulation and eliminating an intermediate conversion step. - Exposed the new transpiler pass via the C API (export_fn added) and updated release notes for user guidance. - Bug/defect activity: no major defects reported; included minor fixes to export_fn exposure and release notes. Overall impact and accomplishments: - Technical: improved transpilation performance and efficiency for Qiskit circuits transpiled through the C API, reducing overhead and enabling scalable handling of larger DAGs. - Business value: faster transpilation improves developer workflows, reduces compute time in CI/CD and local builds, and enhances API ergonomics for C API users. Technologies/skills demonstrated: - C API integration for transpilation passes - DAG-based circuit manipulation techniques - API exports (export_fn) and release notes discipline - Focus on performance optimization and maintainability
May 2026
March 2026
1 Commits • 1 Features
Mar 1, 2026Month: 2026-03 — Focused on delivering DAG-based transpiler optimizations for the Qiskit C API, enabling direct DAG-level passes and reducing circuit-conversion overhead in custom transpilation pipelines. Implemented seven DAG-based passes and integrated them into the transpilation workflow, driving performance and scalability for quantum workloads. This sprint also encompassed code quality improvements (clang-format) and test updates, with cross-team collaboration reflected in co-authored commits and PR #15614. No major bugs fixed this month; the emphasis was on feature delivery and performance gains, setting the foundation for broader adoption of DAG-based passes.
March 2026
1 Commits • 1 Features
Mar 1, 2026Month: 2026-03 — Focused on delivering DAG-based transpiler optimizations for the Qiskit C API, enabling direct DAG-level passes and reducing circuit-conversion overhead in custom transpilation pipelines. Implemented seven DAG-based passes and integrated them into the transpilation workflow, driving performance and scalability for quantum workloads. This sprint also encompassed code quality improvements (clang-format) and test updates, with cross-team collaboration reflected in co-authored commits and PR #15614. No major bugs fixed this month; the emphasis was on feature delivery and performance gains, setting the foundation for broader adoption of DAG-based passes.
Activity
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Quality Metrics
Correctness90.0%
Maintainability80.0%
Architecture90.0%
Performance90.0%
AI Usage30.0%
Skills & Technologies
Programming Languages
CRust
Technical Skills
C programmingDAG manipulationQuantum computingRust programmingTranspiler developmentquantum computingsoftware development
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