Signature of collective emission from a dense atomic ensemble coupled to a nanophotonic resonator

Collective atom-photon interaction has been actively explored in recent years. Control and manipulation on the collective states of atomic system could bring new opportunities for quantum many-body physics and quantum networks. In this talk, we discuss about our investigation on the signatures of collective emission from a dense atomic ensemble coupled to a nanophotonic resonator. With our recent experimental realization of trapping a dense atomic ensemble on an integrated nanophotonic microring resonator, we can study how the ensemble collectively couples to a photonic channel in the resonator and other free pace modes. Specifically, we will show the decay dynamics of an atomic ensemble following long and short excitation pulses, with the former driving the system into a steady-state and the latter into a so-called timed-Dicke state. Our study could shed light on the realization of selective radiance and enable new explorations of collective quantum optics with trapped atoms coupled to nanophotonic circuits.