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About this paper

Juan Cruz-Benito, Andrew W. Cross, David Kremer, Ismael Faro

Researchers at IBM Research developed an LLM-guided evolutionary search framework to discover 465 novel bivariate bicycle (BB) and perturbed bivariate bicycle (PBB) quantum codes at practical block lengths (n <= 360). This framework, employing a multi-stage verification pipeline, significantly expands the catalog of known structured qLDPC codes and provides crucial insights into rate-distance tradeoffs and the limitations of heuristic distance estimation methods.

Key insights

  • LLM-guided program evolution is an effective and feasible approach for discovering complex algebraic structures like quantum codes, outperforming classical genetic algorithms in finding high-distance codes.
  • There exists a consistent empirical tradeoff between encoding rate (k) and minimum distance (d) for BB and PBB codes within the explored parameter space, with high-k codes generally having low distances.
  • Heuristic decoders like BP-OSD systematically and severely overestimate code distance, particularly for high-rate codes (up to 12x), necessitating exact MILP verification for reliable claims.

Summary by alphaXiv.

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