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Analog quantum simulation of the Rabi model in the ultra-strong coupling regime
Jochen Braumüller1, Michael Marthaler2, Andre Schneider3
1Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Straße 1, 76131, Karlsruhe, Germany. jochen.braumueller@kit.edu.
Researchers demonstrate an analog quantum simulation of the quantum Rabi model in the ultra-strong coupling regime using superconducting circuits. They observed distinct quantum state collapses and revivals, validating the simulation of light-matter interactions.
Area of Science:
- Quantum physics
- Quantum optics
- Condensed matter physics
Background:
- The quantum Rabi model is fundamental to understanding light-matter interactions.
- The rotating wave approximation is invalid in the ultra-strong coupling regime, revealing novel system dynamics.
- Analog quantum simulation offers a platform to explore complex quantum phenomena.
Purpose of the Study:
- To perform an analog quantum simulation of the quantum Rabi model in the ultra-strong coupling regime.
- To investigate the system dynamics and observe characteristic signatures of ultra-strong coupling.
- To validate the use of superconducting circuits for simulating quantum light-matter interactions.
Main Methods:
- Utilized a superconducting circuit in a circuit Quantum Electrodynamics (cQED) setup.
- Achieved an effective coupling ratio (g/ω) of approximately 0.6, characteristic of the ultra-strong coupling regime.
- Employed a technique to slow down system dynamics in an effective frame for simulation.
Main Results:
- Successfully simulated the quantum Rabi model in the ultra-strong coupling regime.
- Observed fast and periodic quantum state collapses and revivals of the initial qubit state.
- Demonstrated the distinct signatures predicted for this regime.
Conclusions:
- Analog quantum simulation with superconducting circuits is a viable method for studying the quantum Rabi model at ultra-strong coupling.
- The observed state collapses and revivals confirm the breakdown of the rotating wave approximation and the emergence of new physics.
- This work opens avenues for exploring complex quantum phenomena in light-matter interactions.
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