Solving the quantum many-body problem via correlations measured with a momentum microscope
| Autor: | Hodgman, Sean. S., Khakimov, Roman. I., Lewis-Swan, Robert. J., Truscott, Andrew. G., Kheruntsyan, Karen. V. |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 118, 240402 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.118.240402 |
| Popis: | In quantum many-body theory, all physical observables are described in terms of correlation functions between particle creation/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 multi-particle 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 multi-particle momentum correlations could provide new insights into effects such as unconventional superconductivity and many-body localisation. Comment: Final published version, 15 pages, 8 figures and Supplemental Material |
| Databáze: | arXiv |
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