Quantum Measurements Constrained by Symmetries
Quantum Physics
2013-10-01 v1
Abstract
We revisit the theorem of Wigner, Araki and Yanase (WAY) describing limitations to repeatable quantum measurements that arise from the presence of conservation laws. We will review a strengthening of this theorem by exhibiting and discussing a condition that has hitherto not been identified as a relevant factor. We will also show that an extension of the theorem to continuous variables such as position and momentum can be obtained if the degree of repeatability is suitably quantified.
Cite
@article{arxiv.1303.6536,
title = {Quantum Measurements Constrained by Symmetries},
author = {P. Busch and L. D. Loveridge},
journal= {arXiv preprint arXiv:1303.6536},
year = {2013}
}
Comments
Invited paper, The XXIXth International Colloquium on Group-Theoretical Methods in Physics}, Chern Institute of Mathematics, August 20-26, 2012