Qubit-controlled directional edge states in waveguide QED

Abstract We propose an in-situ tunable chiral quantum system, composed of a emitter coupled to waveguide based on the Rice-Mele model (where we alternate both on-site potentials and tunnel couplings between sites in array). Specifically, show that chirality photonic bound state, emerges bandgap waveguide, depends only energy qubit; parameter is easy tune many artificial atoms. In contrast previous proposals have either shown imperfect or fixed directionality, our electrodynamics scheme achieves perfect capability switch directionality demand with just one element device. also implement state-of-the-art superconducting circuit dot architectures. The results technological promise creating long-range couplers qubits while maintaining, principle, zero crosstalk.