Cavitylike strong coupling in macroscopic waveguide QED using three coupled qubits in the deep non-Markovian regime

Abstract

We introduce a three qubit waveguide QED system to mimic the cavity-QED strong coupling regime of a probe qubit embedded in atomlike mirrors, which was realized in recent experiments. We 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 many orders of magnitude), tune the resonances, as well as realise Fanolike resonances and simultaneous coupling to multiple cavity modes. Exact Green function solutions are presented for the spectral resonances, and the dynamics are simulated using matrix product states, where we also demonstrate additional control of the cavity-QED system using chiral probe qubits.