Cavitylike strong coupling in macroscopic waveguide QED using three coupled qubits in the deep non-Markovian regime
Sofia Arranz Regidor, Stephen Hughes · Physical Review A · 2021
We introduce a three-qubit waveguide-QED system to achieve a cavity-QED strong-coupling regime for a probe qubit embedded in atomlike mirrors, which was realized in recent experiments. We then extend this system into the deep non-Markovian regime and demonstrate the profound role that retardation plays on the dressed resonances, allowing one to significantly improve the polariton lifetimes (by several orders of magnitude), tune the resonances, as well as realize Fano-like resonances and simultaneous coupling to multiple cavity modes. Exact Green's function solutions are presented for the classical spectral resonances, and the full quantum dynamics are simulated using matrix product states, where we demonstrate additional control of the cavity-QED system using chiral probe qubits. We show example qubit dynamics with both one and two quantum excitations.