Editing Quantum tunnelling (section)

==== Tunnel junction ====
{{Main|Tunnel junction}}

A simple barrier can be created by separating two conductors with a very thin [[Insulator (electricity)|insulator]]. These are tunnel junctions, the study of which requires understanding quantum tunnelling.<ref>{{cite book|last1=Lerner|url=https://archive.org/details/encyclopediaofph00lern/page/1308|title=Encyclopedia of Physics|last2=Trigg|publisher=VCH|year=1991|isbn=978-0-89573-752-6|edition=2nd|location=New York|pages=[https://archive.org/details/encyclopediaofph00lern/page/1308 1308–1309]}}</ref> [[Josephson junction]]s take advantage of quantum tunnelling and superconductivity to create the [[Josephson effect]]. This has applications in precision measurements of voltages and [[magnetic fields]],<ref name="Taylor" /> as well as the [[multijunction solar cell]].