# A New Linear-Attention Variant Adds Phase-Controlled Delta Memory to Fix Long-Context State Tracking

Semidirect Fourier Delta Attention keeps a fixed recurrent state instead of a growing key-value cache, using constructive chunk-WY kernels to preserve exact state tracking that linear attention normally loses.

- Published: 2026-07-15T05:45:50.502Z
- Canonical: https://polylog.news/ai/2026-07-15/a-new-linear-attention-variant-adds-phase-controlled-delta-m
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [arXiv](https://arxiv.org/abs/2607.11897)

A new paper, Semidirect Fourier Delta Attention, targets the central weakness of linear attention. Linear attention replaces softmax attention's growing key-value cache with a fixed-size recurrent state, which bounds memory and cost, but th…

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