Causality Constraints on Nonlocal Quantum Measurements
High Energy Physics - Theory
2009-10-22 v1
Abstract
Consequences of relativistic causality for measurements of nonlocal characteristics of composite quantum systems are investigated. It is proved that verification measurements of entangled states necessarily erase local information. A complete analysis of measurability of nondegenerate spin operators of a system of two spin-1/2 particles is presented. It is shown that measurability of certain projection operators which play an important role in axiomatic quantum theory contradicts the causality principle.
Cite
@article{arxiv.hep-th/9306087,
title = {Causality Constraints on Nonlocal Quantum Measurements},
author = {Sandu Popescu and Lev Vaidman},
journal= {arXiv preprint arXiv:hep-th/9306087},
year = {2009}
}
Comments
25 pages, TAUP 2011-92#