Compatibility properties of extreme quantum observables
Quantum Physics
2015-08-19 v2
Abstract
Recently a problem concerning the equivalence of joint measurability and coexistence of quantum observables was solved [15]. In this paper we generalize two known joint measurability results from sharp observables to the class of extreme observables and study relationships between coexistence, joint measurability, and post-processing of quantum observables when an extreme observable is involved. We also discuss another notion of compatibility and provide a counterexample separating this from the former notions.
Cite
@article{arxiv.1404.4172,
title = {Compatibility properties of extreme quantum observables},
author = {Erkka Haapasalo and Juha-Pekka Pellonpää and Roope Uola},
journal= {arXiv preprint arXiv:1404.4172},
year = {2015}
}
Comments
14 pages, some refinements in the proofs of theorems 2 and 3 and Corollary 1 as well as a couple of new references compared to the earlier version