Quantum

Dithered Belief Propagation for Real-Time Quantum Memory Decoding

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 06/11/2026, 05:13:25 UTC.

Briefings

A new quantum decoding method using dithered belief-propagation significantly outperforms standard BP decoders for qLDPC codes. Evaluated on distance-11 and distance-12 surface codes, the approach achieves accuracy comparable to or better than Relay-BP, particularly at higher physical error rates. It reduces computational complexity by 98% fewer multiplications while eliminating node-level random number generators, though it trades moderate additions for these gains.

Key points

• The dithered belief-propagation decoder significantly outperforms standard belief-propagation (BP) decoders for qLDPC codes.
• The proposed decoder achieves accuracy comparable to or better than state-of-the-art Relay-BP, especially at higher physical error rates.

Context

This research addresses oscillations and trapping behavior in circuit-level quantum memory decoding for qLDPC codes. The method combines a quantum-adapted sign-flip mechanism with chained randomized prior perturbation to improve real-time decoding performance.

Limitations

Results are evaluated under circuit-level noise on specific distance-11 and distance-12 surface codes. The study does not provide additional background context beyond the abstract, and the findings represent a snapshot of the proposed method's performance rather than long-term reliability or broader applicability across different hardware platforms.

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