caa a22 4500 445866772 CHVBK 20180317145500.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1140/epjd/e2011-10714-3 doi (NATIONALLICENCE)springer-10.1140/epjd/e2011-10714-3 ‘Measurement of quantum mechanical operators' revisited [Elektronische Daten] [L. Loveridge, P. Busch] The Wigner-Araki-Yanase (WAY) theorem states a remarkable limitation to quantum mechanical measurements in the presence of additive conserved quantities. Discovered by Wigner in 1952, this limitation is known to induce constraints on the control of individual quantum systems in the context of information processing. It is therefore important to understand the precise conditions and scope of the WAY theorem. Here we elucidate its crucial assumptions, briefly review some generalizations, and show how a particular extension can be obtained by a simple modification of the original proofs. We also describe the evolution of the WAY theorem from a strict no-go verdict for certain, highly idealized, precise measurements into a quantitative constraint on the accuracy and approximate repeatability of imprecise measurements. EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg, 2011 Loveridge L. Department of Mathematics, University of York, Mathematical Physics Section, YO10 5DD, York, UK aut Busch P. Department of Mathematics, University of York, Mathematical Physics Section, YO10 5DD, York, UK aut The European Physical Journal D Springer-Verlag 62/2(2011-04-01), 297-307 1434-6060 62:2<297 2011 62 10053 https://doi.org/10.1140/epjd/e2011-10714-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1140/epjd/e2011-10714-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Loveridge L. Department of Mathematics, University of York, Mathematical Physics Section, YO10 5DD, York, UK aut NATIONALLICENCE 700 1- Busch P. Department of Mathematics, University of York, Mathematical Physics Section, YO10 5DD, York, UK aut NATIONALLICENCE 773 0- The European Physical Journal D Springer-Verlag 62/2(2011-04-01), 297-307 1434-6060 62:2<297 2011 62 10053 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer