Phys. Rev. D 29, 223–227 (1984)Is the usual notion of time evolution adequate for quantum-mechanical systems? IReceived 18 October 1982; published in the issue dated 15 January 1984 Circumstances are described wherein no state at a given time (nor any definite evolution from one time to another) can be ascribed to a given physical system, but wherein the system can nonetheless be associated with definite dispersion-free values of a new sort of observable, which we call a "multiple-time" observable. The description of physical systems in terms of these new observables is discussed. It emerges as a by-product of our work that no experiment whatever (albeit that its result is certain) can be carried out on a system without disturbing the values of other measurable quantities. © 1984 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.29.223
DOI:
10.1103/PhysRevD.29.223
PACS:
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