May 2026 — CQCL/tket2: Performance optimization focused on the Modifier Resolver to accelerate test execution and improve CI feedback. Implemented a data-structure-driven optimization by replacing the visited-nodes tracking container with an FxHashSet, addressing bottlenecks and enabling faster validation of changes.

April 2025 performance-focused update for CQCL/tket. Delivered a major optimization to the Greedy Pauli Optimisation pass, achieving approximately 40% reduction in wall-clock time for GreedyPauliSimp on large circuits. The optimization refines lookup tables and cost calculations within GreedyPauliOptimisation, powered by the feature work under Transforms::greedy_pauli_optimisation. This work is tracked under commit a61bbac1c07487521acd8da463023f3c85c799e8 and aligns with performance engineering goals aimed at scalability and throughput.

March 2025 monthly work summary for CQCL/tket: Delivered a new flexible CnX decomposition method using ancilla qubits (CnX_vchain_decomp). The feature includes two variants for ancilla state initialization: ancillas starting in |0> and ancillas in arbitrary states, expanding circuit synthesis capabilities for multi-controlled X gates and enabling more versatile, resource-aware gate decompositions.

February 2025 monthly summary for CQCL/tket focusing on key accomplishments, major fixes, and business impact. Implemented wire swap handling enhancements in circuit analysis and optimization, improved test coverage, and updated dependencies to ensure correctness and stability.