Year: 2025
Type: letter
Abstract: A lemma by Chen et al (2017 J. Phys. A: Math. Theor. 50 475304 ) provides a necessary condition on the structure of any complex Hadamard matrix in a set of four mutually unbiased bases in C 6 . The proof of the lemma is shown to contain a mistake, ultimately invalidating three theorems derived in later publications.
Authors: Daniel McNulty, Stefan Weigert
Institutions: University of Bari Aldo Moro, University of York
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4409524092