Experimental extraction of the quantum effective action for a non-equilibrium many-body system
On the fundamental level, quantum fluctuations or entanglement lead to complex dynamical behaviour in many-body systems for which a description as emergent phenomena can be found within the framework of quantum field theory. A central quantity in these efforts, containing all information about the m...
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| Main Authors: | , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
15 June 2020
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| In: |
Nature physics
Year: 2020, Volume: 16, Issue: 10, Pages: 1012-1016 |
| ISSN: | 1745-2481 |
| DOI: | 10.1038/s41567-020-0933-6 |
| Online Access: | Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.1038/s41567-020-0933-6 Verlag, lizenzpflichtig, Volltext: https://www.nature.com/articles/s41567-020-0933-6 
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| Author Notes: | Maximilian Prüfer, Torsten V. Zache, Philipp Kunkel, Stefan Lannig, Alexis Bonnin, Helmut Strobel, Jürgen Berges and Markus K. Oberthaler |
| Summary: | On the fundamental level, quantum fluctuations or entanglement lead to complex dynamical behaviour in many-body systems for which a description as emergent phenomena can be found within the framework of quantum field theory. A central quantity in these efforts, containing all information about the measurable physical properties, is the quantum effective action. Though non-equilibrium quantum dynamics can be exactly formulated in terms of the quantum effective action, finding solutions is in general beyond the capabilities of classical computers. Here, we present a strategy to determine the non-equilibrium quantum effective action using analogue quantum simulators, and demonstrate our method experimentally with a quasi-one-dimensional spinor Bose gas out of equilibrium. |
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| Item Description: | Das PDF enthält zusätzlich einen Anhang von 7 Seiten Gesehen am 23.06.2020 |
| Physical Description: | Online Resource |
| ISSN: | 1745-2481 |
| DOI: | 10.1038/s41567-020-0933-6 |