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Author

A. Sepehri

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Preprint Sep 2026

Wasserstein mixing of a systematic-scan random rotation sampler

We study the mixing time of a systematic-scan analogue of Kac's walk that was proposed as a fast surrogate for Haar-distributed orthogonal matrices in randomized high-dimensional algorithms and was conjectured to approach Haar measure after only logarithmically many sweeps. We show that this conjectured speed-up does n...

A. Sepehri · 0 citations
Preprint Sep 2026

From Ehrenfest to Heisenberg scales: a hierarchy of mixing times for a phase-randomized quantum baker walk

The quantum baker map is a standard model of quantum chaos, but rigorous analysis of how it spreads random perturbations remains difficult. Following the repeated ``baker plus refreshed diagonal perturbation''architecture of Schack and Caves, we study a tractable strong-noise model based on the Balazs--Voros quantizati...

A. Sepehri · 0 citations

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