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Incremental quantum circuit simulation has emerged as an important tool forsimulation-driven quantum applications, such as circuit synthesis,verification, and analysis. When a small portion of the circuit is modified,the simulator must incrementally update state amplitudes for reasonableturnaround time and productivity. However, this type of incrementality has beenlargely ignored by existing research. To fill this gap, we introduce a newincremental quantum circuit simulator called qTask. qTask leverages atask-parallel decomposition strategy to explore both inter- and intra-gateoperation parallelisms from partitioned data blocks. Our partitioning strategyeffectively narrows down incremental update to a small set of partitionsaffected by circuit modifiers. We have demonstrated the promising performanceof qTask on QASMBench benchmarks. Compared to two state-of-the-art simulators,Qulacs and Qiskit, qTask is respectively 1.46x and 1.71x faster for fullsimulation and 5.77x and 9.76x faster for incremental simulation.

qTask: Task-parallel Quantum Circuit Simulation with Incrementality