Causality Constraints on Nonlocal Quantum Measurements

Details Causality Constraints on Nonlocal Quantum Measurements Causality Constraints on Nonlocal Quantum Measurements

1993-06-18

arxiv.org/abs/hep-th/9306087v1

Physics

High Energy Physics

High Energy Physics - Theory

25 pages, TAUP 2011-92#

Scientific paper

10.1103/PhysRevA.49.4331

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.

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