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Annals of Physics

General state changes in quantum theory

K. Kraus

Published Jun 1, 1971• 749 citations
Publisher
DOI
10.1016/0003-4916(71)90108-4

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Ideal measurements in quantum mechanics can be described formally as instantaneous changes of the state vector or, more generally, of the density matrix WWW. By its lack of covariance, this formalism is not very adequate for relativistic quantum theories such as local field theory. For the latter, we propose a modified formalism, according to which a field measurement in a space-time region CCC changes the field state WWW in the future and side cone of CCC. This proposal is justified by physical considerations.