Do we really understand quantum mechanics?
created: 2004-11-14T12:50:42
references: http://arxiv.org/abs/quant-ph/9810028
volume: 69
language: en
subject: GHZ theorem
abstract: This article presents a general discussion of several aspects of our present understanding of quantum mechanics. The emphasis is put on the very special correlations that this theory makes possible: they are forbidden by very general arguments based on realism and local causality. In fact, these correlations are completely impossible in any circumstance, except the very special situations designed by physicists especially to observe these purely quantum effects. Another general point that is emphasized is the necessity for the theory to predict the emergence of a single result in a single realization of an experiment. For this purpose, orthodox quantum mechanics introduces a special postulate: the reduction of the state vector, which comes in addition to the Schrödinger evolution postulate. Nevertheless, the presence in parallel of two evolution processes of the same object (the state vector) maybe a potential source for conflicts; various attitudes that are possible to avoid this problem are discussed in this text. After a brief historical introduction, recalling how the very special status of the state vector has emerged in quantum mechanics, various conceptual difficulties are introduced and discussed. The Einstein Podolsky Rosen (EPR) theorem is presented with the help of a botanical parable, in a way that emphasizes how deeply the EPR reasoning is rooted into what is often called "scientific method''. In another section the GHZ argument, the Hardy impossibilities, as well as the BKS theorem are introduced in simple terms.
subject: foundations of quantum mechanics
modified: 2024-04-19T16:18:53
references: http://arxiv.org/abs/quant-ph/9606004
is version of: hal-00000001
is part of: LKB
is part of: OMNIPHILO
is part of: SU-SCIENCES
is part of: ALLINSP
is part of: SU-TI
topic: shs.hisphilso
is part of: CIREL-FORMATION
is part of: HIPHISCITECH
references: https://doi.org/10.1119/1.16243
is part of: SORBONNE-UNIVERSITE
is part of: https://data.archives-ouvertes.fr/revue/2872
is part of: CNRS
is part of: ALLIANCE-SU
is part of: PSL
available: 2004-11-14
issued: 2001
subject: alternative theories
is part of: ENS-PARIS
is part of: ENS-PSL
references: physrevlett.74.4091
topic: phys.qphy
bibliographic citation: Franck Laloë. Do we really understand quantum mechanics?. American Journal of Physics, 2001, 69, pp.655 - 701. ⟨10.1119/1.1356698⟩. ⟨hal-00000001v2⟩
page end: 701
references: physreva.54.2759
references: hal-00296897
subject: Bell theorem
arxiv: quant-ph/0209123
references: physreva.39.2277
is part of: UPMC POLE 2
is part of: hal.science
is part of: UPMC
type: Article
doi: 10.1119/1.1356698
references: s0375-9601(99)00646-5
aggregates: mq-anglais.pdf
is part of: SHS
subject: quantum measurement
page start: 655
creator: Author
  person: https://data.archives-ouvertes.fr/author/828332
  structure: https://data.archives-ouvertes.fr/structure/1
references: qua.560180819