Exploring selective radiance with trapped atoms on a nanophotonic resonator
Abstract: Control and manipulation of the collective radiative states of atomic systems could bring new opportunities for quantum many-body physics and quantum networks. In this talk, I will discuss our recent investigation on “selective radiance,” a phenomenon in which an atomic excitation couples to a specific photonic channel with collective enhancement (called ‘superradiance’) but to all other channels with suppression (‘subradiance’). Following our recent experimental realization of cold atom trapping on a nanophotonic microring resonator, we study how a dense atomic ensemble collectively couples to a whispering-gallery-mode in the resonator and to other free space modes. I will discuss 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. I will discuss the potential of our platform to realize selective radiance in an atom array and explore collective quantum optics with trapped atoms coupled to nanophotonic circuits.
Bio: Dr. Hung received his PhD in Physics at the University of Chicago in 2011, where he developed an in-situ microscopy technique on two-dimensional atomic quantum gases to study quantum phase transitions. Before joining Purdue in 2015 as a faculty member, he held a postdoctoral fellowship at the California Institute of Technology and developed one of the first photonic crystal atom-photon interfaces for quantum optics. His research directions at Purdue University span from studying out-of-equilibrium many-body physics using atomic quantum gases to interfacing ultracold atoms with nanophotonic circuits for quantum optics and many-body physics with photon-mediated long-range interactions. He is a recipient of the AFOSR Young Investigator Award and the NSF CAREER award.
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