Abstract
Large ensembles of atoms coupled to resonators are powerful platforms for quantum sensing, simulation and networking. In this talk, I will first focus on a cavity-QED system with cold rubidium atoms coupled to an optical cavity. In this system, I will introduce various tools in which cavity-mediated interactions between matter waves can be utilized to enhance the capability of quantum sensing and simulations. These tools include an entanglement-enhanced matter-wave interferometer, a novel momentum-exchange interactions in a Bragg atom interferometer that suppresses Doppler dephasing, the demonstration of the long-sought two-axis counter-twisting dynamics and the realization of unique three and four-body interactions. If time allows, I will introduce a different cavity-QED system with solid-state spins coupled to a microwave resonator. Enabled by a new rare-earth-doped crystal (171Yb3+:CaWO4) platform with exceptional spin properties, we demonstrated all-to-all spin-exchange interactions in a solid-state platform for the first time. With the emerging many-body energy gap, we realized an on-demand coherence-protected spin memory, paving the way for future long-lived microwave memories for superconducting qubits.
Anyone interested is welcome to attend.