Editing Double-slit experiment (section)

===Many-worlds interpretation===
As with Copenhagen, there are multiple variants of the [[many-worlds interpretation]]. The unifying theme is that physical reality is identified with a wavefunction, and this wavefunction always evolves unitarily, i.e., following the Schrödinger equation with no collapses.<ref>{{Cite journal|last=Kent|first=Adrian|author-link=Adrian Kent|date=February 2015|title=Does it Make Sense to Speak of Self-Locating Uncertainty in the Universal Wave Function? Remarks on Sebens and Carroll |journal=Foundations of Physics |language=en |volume=45 |issue=2 |pages=211–217  |arxiv=1408.1944 |doi=10.1007/s10701-014-9862-5 |issn=0015-9018 |bibcode=2015FoPh...45..211K |s2cid=118471198}}</ref><ref name="vaidman_stanfordencyclopedia">{{cite SEP |last=Vaidman |first=Lev |author-link=Lev Vaidman |title=Many-Worlds Interpretation of Quantum Mechanics |url-id=qm-manyworlds |date=5 August 2021 }}</ref> Consequently, there are many parallel universes, which only interact with each other through interference. [[David Deutsch]] argues that the way to understand the double-slit experiment is that in each universe the particle travels through a specific slit, but its motion is affected by interference with particles in other universes, and this interference creates the observable fringes.<ref>{{Cite book |last=Deutsch |first=David |url=http://archive.org/details/fabricofreality0000deut |title=The Fabric of Reality |date=1998 |location=London |publisher=Penguin  |isbn=978-0-14-014690-5|pages=40–53}}</ref> David Wallace, another advocate of the many-worlds interpretation, writes that in the familiar setup of the double-slit experiment the two paths are not sufficiently separated for a description in terms of parallel universes to make sense.<ref>{{cite book|first=David |last=Wallace |title=The Emergent Multiverse |page=382 |publisher=Oxford University Press |location=Oxford |isbn=978-0-19-954696-1 |year=2012}}</ref>