Two-Photon Scattering in Multiple Giant-Atom Waveguide QED

Giant atoms, realized as superconducting circuits, represent a leading platform for quantum computing hardware. In this poster, we focus on the problem of scattering of two waveguided photons from a chain of multiple (one to five) two-level giant atoms coupled to a bidirectional waveguide. Employing a real-space formulation, we utilize the Bethe ansatz to obtain analytic solutions for the two-photon scattering problem. Our results demonstrate how multiple giant atoms affect the joint probability of two-photon transmission and reflection. These findings offer insight into controlling two-photon transport in waveguide quantum electrodynamics (QED) through multi-giant-atom interactions and underscore the potential of superconducting circuits as a scalable platform for quantum information transfer. In future work, we aim to extend this work to the two-photon bound-state formation in the presence of decoherence.