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arXiv · 2507.12642

QSpark: Towards Reliable Qiskit Code Generation

Kiana Kheiri·Aamna Aamir·Andriy Miranskyy·Chen Ding
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Abstract

Quantum circuits must be error-resilient, yet LLMs like Granite-20B-Code and StarCoder often output flawed Qiskit code. We fine-tuned the Qwen2.5-Coder-32B model with two RL methods, Group Relative Policy Optimization (GRPO) and Odds-Ratio Preference Optimization (ORPO), using a richly annotated synthetic dataset. On the Qiskit HumanEval benchmark, ORPO reaches 56.29% Pass@1 ($\approx+10$ pp over Granite-8B-QK) and GRPO hits 49%, both beating all general-purpose baselines; on the original HumanEval they score 65.90% and 63.00%. GRPO performs well on basic tasks (44/78) and excels on intermediate ones (41/68), but neither GRPO nor ORPO solves any of the five advanced tasks, highlighting clear gains yet room for progress in AI-assisted quantum programming.

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Kiana Kheiri, Aamna Aamir, Andriy Miranskyy, Chen Ding. 2025-07-16. QSpark: Towards Reliable Qiskit Code Generation. https://arxiv.org/abs/2507.12642

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