ResearchResearch paperEfficiency & Inference1 source · Oct 12, 2026

A Bethe-Ansatz Source of Early Token Correlations: A marginal-preserving construction for parallel proposals

Parallel token proposals in language-model decoding need a joint law, not merely accurate token marginals.

Key points

  • We construct a family of coordinate-Bethe-ansatz laws from the periodic XXZ chain and compare each with its maximum-entropy pairwise projection at identical one- and two-site moments.
  • A nonlinear readout transfers a nonzero gap into the first two token positions while preserving their separate marginals.
  • At $Δ=1.5$ the deterministic binary token laws differ by 0.02654573 in total variation.
  • Exact speculative verification then gives a strict accepted-prefix advantage for a constructed target and a neighborhood within targets sharing its first-token marginal.

Sources (1)

Extractive summary: sentences quoted from the sources.

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