Solving the quantum many-body problem via correlations measured with a momentum microscope

Hodgman, S. S., Khakimov, R. I., Lewis-Swan, R. J., Truscott, A. G. and Kheruntsyan, K. V. (2017) Solving the quantum many-body problem via correlations measured with a momentum microscope. Physical Review Letters, 118 24: 240402. doi:10.1103/PhysRevLett.118.240402


Author Hodgman, S. S.
Khakimov, R. I.
Lewis-Swan, R. J.
Truscott, A. G.
Kheruntsyan, K. V.
Title Solving the quantum many-body problem via correlations measured with a momentum microscope
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
1079-7114
Publication date 2017-06-14
Year available 2017
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.118.240402
Open Access Status Not yet assessed
Volume 118
Issue 24
Start page 240402
Total pages 6
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Abstract In quantum many-body theory, all physical observables are described in terms of correlation functions between particle creation or annihilation operators. Measurement of such correlation functions can therefore be regarded as an operational solution to the quantum many-body problem. Here, we demonstrate this paradigm by measuring multiparticle momentum correlations up to third order between ultracold helium atoms in an s-wave scattering halo of colliding Bose-Einstein condensates, using a quantum manybody momentum microscope. Our measurements allow us to extract a key building block of all higherorder correlations in this system-the pairing field amplitude. In addition, we demonstrate a record violation of the classical Cauchy-Schwarz inequality for correlated atom pairs and triples. Measuring multiparticle momentum correlations could provide new insights into effects such as unconventional superconductivity and many-body localization.
Formatted abstract
In quantum many-body theory, all physical observables are described in terms of correlation functions between particle creation or annihilation operators. Measurement of such correlation functions can therefore be regarded as an operational solution to the quantum many-body problem. Here, we demonstrate this paradigm by measuring multiparticle momentum correlations up to third order between ultracold helium atoms in an s-wave scattering halo of colliding Bose-Einstein condensates, using a quantum many-body momentum microscope. Our measurements allow us to extract a key building block of all higher-order correlations in this system—the pairing field amplitude. In addition, we demonstrate a record violation of the classical Cauchy-Schwarz inequality for correlated atom pairs and triples. Measuring multiparticle momentum correlations could provide new insights into effects such as unconventional superconductivity and many-body localization.
Keyword Physics, Multidisciplinary
Physics
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID DP120101390
DE150100315
FT100100468
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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