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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Hauptverfasser: Prüfer, Maximilian (Verfasst von) , Zache, Torsten Victor (Verfasst von) , Kunkel, Philipp (Verfasst von) , Lannig, Stefan (Verfasst von) , Bonnin, Alexis (Verfasst von) , Strobel, Helmut (Verfasst von) , Berges, Jürgen (Verfasst von) , Oberthaler, Markus K. (Verfasst von)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 15 June 2020
In: Nature physics
Year: 2020, Jahrgang: 16, Heft: 10, Pages: 1012-1016
ISSN:1745-2481
DOI:10.1038/s41567-020-0933-6
Online-Zugang: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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Verfasserangaben:Maximilian Prüfer, Torsten V. Zache, Philipp Kunkel, Stefan Lannig, Alexis Bonnin, Helmut Strobel, Jürgen Berges and Markus K. Oberthaler
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Zusammenfassung: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.
Beschreibung:Das PDF enthält zusätzlich einen Anhang von 7 Seiten
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Beschreibung:Online Resource
ISSN:1745-2481
DOI:10.1038/s41567-020-0933-6