Near-ground-state cooling of atoms optically trapped 300nm away from a hot surface

摘要: Laser-cooled atoms coupled to nanophotonic structures constitute a powerful research platform for the exploration of new regimes light-matter interaction. While initialization atomic internal degrees freedom in these systems has been achieved, full preparation quantum state also requires controlling center mass motion at level. Obtaining such control is not straightforward, due close vicinity photonic system that ambient temperature. Here, we demonstrate cooling individual neutral Cesium atoms, are optically interfaced with light an optical nanofiber, preparing them their three-dimensional motional ground state. The localized less than 300nm away from hot fiber surface. Ground-state achieved by performing degenerate Raman cooling, and temperature inferred analysis heterodyne fluorescence spectroscopy signals. Our method can be implemented either externally applied or guided fields. Moreover, it relies on polarization gradients which naturally occur strongly confined Thus, this any trap based structures. results provide ideal starting point study novel effects as light-induced self-organization, measurement forces, investigation heat transfer nanoscale using probes.