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Quantum turbulence
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==== Detection in <sup>3</sup>He-B and atomic condensates ==== Quantum turbulence can be detected in <sup>3</sup>He-B in two ways: nuclear magnetic resonance (NMR) <ref>{{Cite journal|last1=Finne|first1=A. P.|last2=Araki|first2=T.|last3=Blaauwgeers|first3=R.|last4=Eltsov|first4=V. B.|last5=Kopnin|first5=N. B.|last6=Krusius|first6=M.|last7=Skrbek|first7=L.|last8=Tsubota|first8=M.|last9=Volovik|first9=G. E.|date=August 2003|title=An intrinsic velocity-independent criterion for superfluid turbulence|url=https://www.nature.com/articles/nature01880|journal=Nature|language=en|volume=424|issue=6952|pages=1022β1025|doi=10.1038/nature01880|pmid=12944960|issn=1476-4687|arxiv=cond-mat/0304586|bibcode=2003Natur.424.1022F |s2cid=11251284}}</ref> and by Andreev scattering of thermal quasiparticles.<ref>{{Cite journal|last1=Fisher|first1=S. N.|last2=Jackson|first2=M. J.|last3=Sergeev|first3=Y. A.|last4=Tsepelin|first4=V.|date=2014-03-25|title=Andreev reflection, a tool to investigate vortex dynamics and quantum turbulence in 3He-B|journal=Proceedings of the National Academy of Sciences|volume=111|issue=Supplement 1|pages=4659β4666|doi=10.1073/pnas.1312543110|pmc=3970857|pmid=24704872|doi-access=free}}</ref> For atomic condensates, it is typical that the condensate must be expanded (by switching off the trapping potential) so that is sufficiently large for an image to be taken. This procedure has a disadvantage as it leads to the condensate being destroyed. The outcome leads to a 2-dimensional image which allows for the study of 2-dimensional quantum turbulence, but imposes a constraint studying 3-dimensional quantum turbulence using this method. Individual quantum vortices have been observed in 3-dimensions, moving and reconnecting using a technique which extracts small fractions of the condensate at a time, allowing for the observation of a time sequence of the same vortex configuration.
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