caa a22 4500 469031476 CHVBK 20180323132744.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF01883899 doi (NATIONALLICENCE)springer-10.1007/BF01883899 Ballentine L. Physics Department, Simon Fraser University, V5A 1S6, Burnaby, B.C., Canada aut Can one detect the state of an individual system? [Elektronische Daten] [L. Ballentine] Some interpretations of quantum mechanics regard a mixed quantum state as a ensemble, each individual member of which has a definite but unknown state vector. Other interpretations ascribe a state vector only to anensemble of similarly prepared systems, but not to anindividual. Previous attempts to detect the hypothetical individual state vectors have failed, essentially because the state operator (density matrix) enters the relevant equations linearly. An example from nonlinear dynamics, in which a density matrix enters nonlinearly, is examined because it might appear to circumvent this difficulty. However, it is shown that the hypothetical individual state vectors can not be detected this way, so the adequacy of theensemble interpretation survives a critical test. Plenum Publishing Corporation, 1992 Foundations of Physics Kluwer Academic Publishers-Plenum Publishers 22/3(1992-03-01), 333-342 0015-9018 22:3<333 1992 22 10701 https://doi.org/10.1007/BF01883899 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01883899 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Ballentine L. Physics Department, Simon Fraser University, V5A 1S6, Burnaby, B.C., Canada aut NATIONALLICENCE 773 0- Foundations of Physics Kluwer Academic Publishers-Plenum Publishers 22/3(1992-03-01), 333-342 0015-9018 22:3<333 1992 22 10701 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer