We present a null witness of the dimension of a quantum system, discriminating real, complex and classical spaces, based on equality due to linear independence. The witness involves only a single measurement with sufficiently many outcomes and prepared input states. In addition, for intermediate dimensions, the witness bounds saturate for a family of equiangular tight frames including symmetric informationally complete positive operator valued measures. Such a witness requires a minimum of resources, being robust against many practical imperfections. We also discuss errors due to finite statistics.
@article{arxiv.2305.08395,
title = {Null dimension witness based on single measurements},
author = {Josep Batle and Adam Bednorz},
journal= {arXiv preprint arXiv:2305.08395},
year = {2024}
}