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

Braumüller, J., Marthaler, M., Schneider, A., Stehli, A., Rotzinger, H., Weides, M. and Ustinov, A. V. (2017) Analog quantum simulation of the Rabi model in the ultra-strong coupling regime. Nature Communications, 8, 779. (doi:10.1038/s41467-017-00894-w) (PMID:28974675) (PMCID:PMC5626763)

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Abstract

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.

Item Type:Articles
Additional Information:This work was supported by the European Research Council (ERC) within consolidator Grant No. 648011 and through the KIT Nanostructure Service Laboratory (NSL). This work was also supported in part by the Ministry for Education and Science of the Russian Federation via NUST MISIS under contract K2-2016-063. J.B. acknowledges financial support by the Landesgraduiertenförderung (LGF) of the federal state Baden-Württemberg and by the Helmholtz International Research School for Teratronics (HIRST). A. Sch. acknowledges financial support by the Carl-Zeiss-Foundation.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Weides, Professor Martin
Authors: Braumüller, J., Marthaler, M., Schneider, A., Stehli, A., Rotzinger, H., Weides, M., and Ustinov, A. V.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Nature Communications
Publisher:Nature Publishing Group
ISSN:2041-1723
ISSN (Online):2041-1723
Published Online:03 October 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Nature Communications
Publisher Policy:Reproduced under a Creative Commons License

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