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

Jochen Braumüller (), Michael Marthaler, Andre Schneider, Alexander Stehli, Hannes Rotzinger, Martin Weides and Alexey V. Ustinov
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Jochen Braumüller: Physikalisches Institut, Karlsruhe Institute of Technology
Michael Marthaler: Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology
Andre Schneider: Physikalisches Institut, Karlsruhe Institute of Technology
Alexander Stehli: Physikalisches Institut, Karlsruhe Institute of Technology
Hannes Rotzinger: Physikalisches Institut, Karlsruhe Institute of Technology
Martin Weides: Physikalisches Institut, Karlsruhe Institute of Technology
Alexey V. Ustinov: Physikalisches Institut, Karlsruhe Institute of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-00894-w

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