Ultrastrong Coupling in the Near-field of Complementary Split Ring Resonators

Abstract

The ultrastrong light-matter interaction regime was investigated in metallic and superconducting complementary split ring resonators coupled to the cyclotron transition of two dimensional electron gases. The sub-wavelength light confinement and the large optical dipole moment of the cyclotron transition yield record high normalized coupling rates of up to $\frac{{\Omega }_R}{{\omega }_c}=$ 0.87. We observed a blue-shift of both polaritons due to the diamagnetic term of the interaction Hamiltonian.

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• Single-photon-induced two qubits excitation without breaking parity symmetry
• Measuring intensity correlations of a THz quantum cascade laser around its threshold at sub-cycle timescales
• Quantum Simulation of Non-perturbative Cavity QED with Trapped Ions