Speaker
Description
A variety of theoretical frameworks predict the existence of spin dependent interactions beyond the Standard Model, such as dark matter and spin gravity coupling. Spin based quantum sensors, which leverage quantum coherence and precision control of quantum spins, provide an exceptionally powerful platform for probing such exotic interactions. In this talk, I will introduce our recently developed ultra sensitive atomic magnetometers based on spin amplification, which achieve magnetic field sensitivities at the femtotesla (fT) level. Unlike conventional Spin Exchange Relaxation Free (SERF) magnetometers, our approach does not require a zero field environment, and further offers significantly better energy resolution by using nuclear spins as the sensing system. Based on these advances, we have launched the SAPPHIRE (Spin Amplifier for Particle Physics Research) project, dedicated to resonant searches for exotic spin dependent interactions. Our latest experimental results have established new stringent constraints on axion like dark matter and exotic spin dependent forces, surpassing limits from previous astrophysical observations. In addition, we have successfully built a GPS-synchronized network of spin based quantum sensors across multiple cities. This distributed quantum sensor network opens new opportunities for exploring large scale structures and phenomena, ranging from dark matter detection and high precision geomagnetic monitoring to future space based applications.