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

作者：Braumueller Jochen; Marthaler Michael; Schneider Andre; Stehli Alexander; Rotzinger Hannes; Weides Martin; Ustinov Alexey V

来源：Nature Communications, 2017, 8(1): 779.

DOI：10.1038/s41467-017-00894-w

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. 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/omega similar to 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.

• 出版日期2017-10-3