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Analog quantum simulation of the Rabi model in the ultra-strong coupling regime

Braumüller, Jochen 1; Marthaler, Michael 2; Schneider, Andre 1; Stehli, Alexander 1; Rotzinger, Hannes ORCID iD icon 1; Weides, Martin 1; Ustinov, Alexey V. 1
1 Physikalisches Institut (PHI), Karlsruher Institut für Technologie (KIT)
2 Institut für Theoretische Festkörperphysik (TFP), Karlsruher Institut für Technologie (KIT)


The quantum Rabi model describes the fundamental mechanism of light-matter interaction. It consists of a two-level atom or qubit coupled to a quantized harmonic mode via a transversal interaction. In the weak coupling regime, it reduces to the well-known Jaynes–Cummings model by applying a rotating wave approximation. The rotating wave approximation breaks down in the ultra-strong coupling regime, where the effective coupling strength $g$ is comparable to the energy ω of the bosonic mode, and remarkable features in the system dynamics are revealed. Here we demonstrate an analog quantum simulation of an effective quantum Rabi model in the ultra-strong coupling regime, achieving a relative coupling ratio of $g$/ω ~ 0.6. The quantum hardware of the simulator is a superconducting circuit embedded in a cQED setup. We observe fast and periodic quantum state collapses and revivals of the initial qubit state, being the most distinct signature of the synthesized model.

Volltext §
DOI: 10.5445/IR/1000075691
DOI: 10.1038/s41467-017-00894-w
Zitationen: 104
Web of Science
Zitationen: 105
Zitationen: 129
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Festkörperphysik (TFP)
Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000075691
Erschienen in Nature Communications
Verlag Nature Research
Band 8
Heft 1
Seiten Art. Nr. 779
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Nachgewiesen in Web of Science
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