Cavity QED with trapped atoms on a nanophotonic microring circuit

Atoms trapped and interfaced with guided light in nanophotonic circuits form an exciting new platform for fundamental research and applications in quantum optics, quantum many-body physics and quantum networks. The ability to form an organized atom–nanophotonic hybrid lattice, and to induce tunable long-range atom-atom interactions with photons present a novel opportunity to explore collective quantum optics and many-body physics. Our system is based on high quality silicon nitride microring resonators fabricated on a transparent membrane substrate, which is compatible with laser cooling and trapping of cold atoms. This platform holds great promises as a scalable on-chip atom cavity QED system with potentially high cooperativity parameters C ≈ 500. We present our on-going experimental effort for trapping and coupling atoms with a microring, and improvements of the microring platform for future applications as a high-fidelity atom-photon quantum interface.