Seminar by Dr Hsiang-Hua Jen 'Cooperative light emissions from many quantum emitters'

Speaker: Dr Hsiang-Hua Jen, Assistant Research Scholar, IOP, Academia Sinica, Taiwan

Talk title: Cooperative light emissions from many quantum emitters

Abstract: Collective light-matter interaction is the essence for many interesting phenomena and applications in quantum interface and simulations of many-body states. Here first I focus on superradiance, subradiance, and its light scattering from many two-level quantum emitters in free space. We theoretically investigate the light scattering patterns of super- and sub-radiant states on an atomic ring prepared by single photon excitation carrying an orbital angular momentum (OAM). The superradiant modes predominantly scatter photons in the forward-backward direction, while the subradiant modes preferentially scatter photons in the transversal directions, which can be detectable in the far-field radiation patterns, and further allow quantum storage of single photon with an OAM. Next I will focus on chiral-coupled atomic chain with infinite dipole-dipole interactions mediated by a waveguide or nanofiber. This one-dimensional system shows interesting subradiant dynamics and presents many fascinating interaction-driven steady-state phases under a driven-dissipative model.