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Causality constraints on nonlocal quantum measurements
1994
Physical Review A. Atomic, Molecular, and Optical Physics
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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.
doi:10.1103/physreva.49.4331
pmid:9910746
fatcat:sr2g7actazcavhrib675cwigmu