Qiskit/qiskit
Oct 2024 – Apr 2026
4 Months active
Languages Used
PythonRustYAML
Technical Skills
Circuit DesignPythonQuantum ComputingRustTranspiler OptimizationDocumentation
Kevin J. Sung
PROFILE
Kevin J. Sung
Worked on the Qiskit/qiskit repository, delivering four features and a bug fix over four months. Developed a Rust-based transpiler pass to remove identity-equivalent gates, optimizing quantum circuit execution and supporting parameterized and custom gates. Refactored excitation-preserving routines to use XXPlusYYGate, simplifying circuit representation and adding equivalence rules and tests. Enhanced static analysis and maintainability by introducing type annotations in Python modules. Improved the plot_bloch_vector API for better data visualization, updated documentation for clarity, and corrected YAML formatting in release notes. Focused on circuit design, transpiler optimization, and documentation, demonstrating depth in Python, Rust, and quantum computing.
Overall Statistics
Feature vs Bugs
80%Features
Repository Contributions
6Total
Bugs
1
Commits
6
Features
4
Lines of code
668
Activity Months4
Your Network
311 peopleSame Organization
@umich.edu227
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Work History
April 2026
2 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary focused on Qiskit/qiskit Bloch vector API enhancements and documentation improvements. Delivered API enhancements to plot_bloch_vector to accept tuple inputs for improved data representation, fixed type annotations, and updated documentation. Added release notes documenting the change and corrected YAML formatting in release notes. Updated coord_type documentation to clarify Cartesian vs spherical usage. This work improves API usability, data representation, and developer experience, with clear, machine-readable release notes supporting smoother onboarding and deployment.
2 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary focused on Qiskit/qiskit Bloch vector API enhancements and documentation improvements. Delivered API enhancements to plot_bloch_vector to accept tuple inputs for improved data representation, fixed type annotations, and updated documentation. Added release notes documenting the change and corrected YAML formatting in release notes. Updated coord_type documentation to clarify Cartesian vs spherical usage. This work improves API usability, data representation, and developer experience, with clear, machine-readable release notes supporting smoother onboarding and deployment.
April 2026
April 2025
2 Commits • 2 Features
Apr 1, 2025April 2025: Delivered two feature-focused improvements in Qiskit/qiskit with clear business value and maintainability benefits. The XXPlusYYGate integration for excitation_preserving refactors the codebase to use XXPlusYYGate instead of separate RXX/RYY gates, adds an equivalence rule to the library, and includes a new transpilation test to verify behavior, paving the way for potentially cleaner circuits and compiler optimizations. Separately, static typing improvements were applied to the n_local module by adding return type annotations for efficient_su2 and excitation_preserving, improving static analysis, developer onboarding, and long-term maintainability. Impact highlights: simplified gate representations can reduce circuit depth and improve transpiler opportunities; improved code quality and type safety support faster development cycles and fewer runtime errors.
April 2025
2 Commits • 2 Features
Apr 1, 2025April 2025: Delivered two feature-focused improvements in Qiskit/qiskit with clear business value and maintainability benefits. The XXPlusYYGate integration for excitation_preserving refactors the codebase to use XXPlusYYGate instead of separate RXX/RYY gates, adds an equivalence rule to the library, and includes a new transpilation test to verify behavior, paving the way for potentially cleaner circuits and compiler optimizations. Separately, static typing improvements were applied to the n_local module by adding return type annotations for efficient_su2 and excitation_preserving, improving static analysis, developer onboarding, and long-term maintainability. Impact highlights: simplified gate representations can reduce circuit depth and improve transpiler opportunities; improved code quality and type safety support faster development cycles and fewer runtime errors.
February 2025
1 Commits
Feb 1, 2025February 2025 monthly summary for Qiskit/qiskit focusing on documentation hygiene and bugfix quality. Delivered a targeted documentation correction for XXMinusYYGate to clarify qubit ordering conventions and their impact on gate application and phase, preventing misinterpretation and incorrect usage by users.
1 Commits
Feb 1, 2025February 2025 monthly summary for Qiskit/qiskit focusing on documentation hygiene and bugfix quality. Delivered a targeted documentation correction for XXMinusYYGate to clarify qubit ordering conventions and their impact on gate application and phase, preventing misinterpretation and incorrect usage by users.
February 2025
October 2024
1 Commits • 1 Features
Oct 1, 2024Month: 2024-10. Key features delivered: Introduced RemoveIdentityEquivalent transpiler pass for Qiskit/qiskit, rewritten in Rust for performance. It removes gates functionally equivalent to identity within a tolerance and supports parameterized and custom gates while leaving zero-qubit gates unchanged. Commit e89cb474b686b08e764a7841bac52cd5b2b29596 (#12384). Major bugs fixed: none reported this month. Overall impact and accomplishments: Circuit simplification and potential runtime/cost reductions in quantum computations; enhanced transpiler performance and scalability through a Rust-based implementation and broader gate-type support. Technologies/skills demonstrated: Rust-based performance optimization, transpiler pass design, gate-type coverage (including parameterized and custom gates), tolerance-based optimization, and traceability with commits.
October 2024
1 Commits • 1 Features
Oct 1, 2024Month: 2024-10. Key features delivered: Introduced RemoveIdentityEquivalent transpiler pass for Qiskit/qiskit, rewritten in Rust for performance. It removes gates functionally equivalent to identity within a tolerance and supports parameterized and custom gates while leaving zero-qubit gates unchanged. Commit e89cb474b686b08e764a7841bac52cd5b2b29596 (#12384). Major bugs fixed: none reported this month. Overall impact and accomplishments: Circuit simplification and potential runtime/cost reductions in quantum computations; enhanced transpiler performance and scalability through a Rust-based implementation and broader gate-type support. Technologies/skills demonstrated: Rust-based performance optimization, transpiler pass design, gate-type coverage (including parameterized and custom gates), tolerance-based optimization, and traceability with commits.
Activity
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Quality Metrics
Correctness100.0%
Maintainability96.6%
Architecture93.4%
Performance90.0%
AI Usage23.4%
Skills & Technologies
Programming Languages
PythonRustYAML
Technical Skills
Circuit DesignCode RefactoringDocumentationGate DecompositionPythonPython programmingQuantum ComputingRustTestingTranspiler OptimizationType Hintingdata visualizationdocumentationsoftware documentation
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