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THU: Thursday Contributed Sessions

THU 1: Fault-Tolerant Quantum Computing: Contributed Session (Quantum Error Correction)

THU 1.5: Vortrag

Donnerstag, 11. September 2025, 15:15–15:30, ZHG001

Benchmarking decoding accuracy — •Kiara Hansenne¹, Pierre Cussenot^{1, 2}, Anthony Benois¹, Grégoire Misguich¹, and Nicolas Sangouard¹ — ¹Université Paris Saclay, CNRS, CEA, Institut de Physique Théorique, 91191 Gif-sur-Yvette, France — ²Direction Générale de l'Armement, 75015 Paris, France

The development of practical quantum computers is currently a major research topic, with quantum error correction playing a crucial role in achieving fault-tolerant quantum computing. Researchers are working towards qubits with physical noise rate below the error correction code threshold, a critical metric for evaluating an error correction code. This threshold is highly influenced by the noise model and by the decoding techniques used.

In this work, we propose to compare the performances of different decoding strategies (such as belief-propagation or minimum-weight perfect matching) against optimal decoding. Whereas such analysis is usually done by error sampling, our approach follows the quantum state through the circuit, allowing us to reach arbitrarily small error rates. Although this limits the exploration to small code distances, our results will provide essential benchmarks for current decoders and potentially estimate code thresholds with higher accuracy.

Keywords: Quantum error correction; Decoding problem