The Singer-Zauner gap for equiangular tight frames
Functional Analysis
2026-05-28 v1 Metric Geometry
Abstract
We show that there does not exist a complex equiangular tight frame with The proof, which originated from an internal model at OpenAI, mimics the relationship between real equiangular tight frames and strongly regular graphs.
Cite
@article{arxiv.2605.28738,
title = {The Singer-Zauner gap for equiangular tight frames},
author = {Matthew Fickus and John Jasper and Dustin G. Mixon},
journal= {arXiv preprint arXiv:2605.28738},
year = {2026}
}