Editing Double-slit experiment (section)

===Copenhagen interpretation===
{{Main|Copenhagen interpretation}}
The [[Copenhagen interpretation]] is a collection of views about the meaning of [[quantum mechanics]], stemming from the work of [[Niels Bohr]], [[Werner Heisenberg]], [[Max Born]], and others. The term "Copenhagen interpretation" was apparently coined by Heisenberg during the 1950s to refer to ideas developed in the 1925–1927 period, glossing over his disagreements with Bohr.<ref name="Faye-Stanford"/><ref name="camilleri2015">{{cite journal|first1=K. |last1=Camilleri |first2=M. |last2=Schlosshauer |title=Niels Bohr as Philosopher of Experiment: Does Decoherence Theory Challenge Bohr's Doctrine of Classical Concepts? |arxiv=1502.06547 |journal=[[Studies in History and Philosophy of Modern Physics]] |volume=49 |pages=73–83 |year=2015 |doi=10.1016/j.shpsb.2015.01.005|bibcode=2015SHPMP..49...73C |s2cid=27697360 }}</ref><ref>{{cite book |last=Scheibe |first=Erhard |title=The Logical Analysis of Quantum Mechanics |publisher=Pergamon Press |year=1973 |isbn=978-0-08-017158-6 |oclc=799397091 |quote=[T]here is no point in looking for ''the'' Copenhagen interpretation as a unified and consistent logical structure. Terms such as "Copenhagen interpretation" or "Copenhagen school" are based on the history of the development of quantum mechanics; they form a simplified and often convenient way of referring to the ideas of a number of physicists who played an important role in the establishment of quantum mechanics, and who were collaborators of Bohr's at his Institute or took part in the discussions during the crucial years. On closer inspection, one sees quite easily that these ideas are divergent in detail and that in particular the views of Bohr, the spiritual leader of the school, form a separate entity which can now be understood only by a thorough study of as many as possible of the relevant publications by Bohr himself. |author-link=Erhard Scheibe}}</ref><ref name="Mermin 2017">{{Cite book |last=Mermin |first=N. David |title=Quantum [Un]Speakables II |date=2017-01-01 |publisher=Springer International Publishing |isbn=978-3-319-38985-1 |editor-last=Bertlmann |editor-first=Reinhold |series=The Frontiers Collection |pages=83–93 |language=en |chapter=Why QBism Is Not the Copenhagen Interpretation and What John Bell Might Have Thought of It |doi=10.1007/978-3-319-38987-5_4 |editor2-last=Zeilinger |editor2-first=Anton |editor-link2=Anton Zeilinger |arxiv=1409.2454 |s2cid=118458259}}</ref> Consequently, there is no definitive historical statement of what the interpretation entails. Features common across versions of the Copenhagen interpretation include the idea that quantum mechanics is intrinsically [[Indeterminism|indeterministic]], with probabilities calculated using the [[Born rule]], and some form of [[Complementarity (physics)|complementarity]] principle.<ref name="omnes1999">{{cite book|last=Omnès |first=Roland |author-link=Roland Omnès |chapter=The Copenhagen Interpretation |title=Understanding Quantum Mechanics |publisher=Princeton University Press |year=1999 |doi=10.2307/j.ctv173f2pm.9 |s2cid=203390914 }}</ref>{{rp|41–54}} Moreover, the act of "observing" or "measuring" an object is irreversible, and no truth can be attributed to an object, [[counterfactual definiteness|except according to the results of its measurement]]. In the Copenhagen interpretation, complementarity means a particular experiment can demonstrate particle behavior (passing through a definite slit) or wave behavior (interference), but not both at the same time.<ref name="omnes1999"/>{{rp|49|q=We may speak of an electron by using the language of waves when it crosses two slits in an interfering device, and we speak of the same electron as a particle when it is detected, but we cannot use the two modes of speaking at the same time.}}<ref>{{Cite journal |last=Rosenfeld |first=L. |author-link=Léon Rosenfeld |date=1953 |title=Strife about Complementarity |journal=Science Progress (1933– ) |volume=41 |issue=163 |pages=393–410 |issn=0036-8504 |jstor=43414997}}</ref><ref name="peres">{{Cite book|last=Peres|first=Asher|title=[[Quantum Theory: Concepts and Methods]]|publisher=Kluwer Academic Publishers|year=1995|isbn=0-7923-2549-4|author-link=Asher Peres |pages=36–39}}</ref> In a Copenhagen-type view, the question of which slit a particle travels through has no meaning when there is no detector.<ref name="omnes">{{cite book|first=R. |last=Omnès |author-link=Roland Omnès |title=The Interpretation of Quantum Mechanics |publisher=Princeton University Press |year=1994 |isbn=978-0-691-03669-4 |oclc=439453957 |page=167}}</ref><ref>{{cite book |last1=Brukner |first1=Časlav |chapter=Quantum Physics as a Science of Information |date=2005 |title=Quo Vadis Quantum Mechanics? |pages=47–61 |editor-last=Elitzur |editor-first=Avshalom C. |place=Berlin, Heidelberg |publisher=Springer  |language=en |doi=10.1007/3-540-26669-0_3 |isbn=978-3-540-22188-3 |last2=Zeilinger |first2=Anton |author-link1=Časlav Brukner |author-link2=Anton Zeilinger |editor2-last=Dolev |editor2-first=Shahar |editor3-last=Kolenda |editor3-first=Nancy}}</ref>