Berlin 2018 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 105: Focus Session: Mesoscopic Superconductivity and Quantum Circuits
TT 105.6: Invited Talk
Friday, March 16, 2018, 12:15–12:35, H 0104
Quantum Simulation of Light-Matter Interaction — •Jochen Braumüller1, Michael Marthaler2, Andre Schneider1, Alexander Stehli1, Hannes Rotzinger1, Martin Weides1, and Alexey V. Ustinov1,3 — 1Physikalisches Institut, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — 2Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, Karlsruhe, Germany — 3Russian Quantum Center, National University of Science and Technology MISIS, Moscow, Russia
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 oscillator mode via a transversal interaction. In the small coupling regime, it reduces to the well-known Jaynes-Cummings model by applying a rotating wave approximation (RWA). In the ultra-strong coupling (USC) regime, where the effective coupling strength is comparable to the subsystem energies, the RWA breaks down and remarkable features in the system dynamics are revealed. We demonstrate an analog quantum simulation of an effective quantum Rabi model in the ultra-strong coupling regime, achieving a relative coupling ratio of up to 0.6. The quantum hardware of the simulator is a superconducting circuit. We observe fast and periodic quantum state collapses and revivals of the initial qubit state as one of the hallmark signatures of USC dynamics. As an outlook, we demonstrate first experimental efforts in implementing the spin boson model.
Braumüller et al., Nat. Commun. 8, 779 (2017)