Towards cold atomic sensors with millimeter-resolution

Quantum sensors utilizing ultra-cold atoms are increasingly being recognized for their potential to enhance and even exceed the capabilities of traditional measurement techniques. However, the standard six orthogonal laser beams to form a three-dimensional magneto-optical trap (MOT) within vacuum chambers and glass cells limits the minimum achievable distance between the trapped atoms and the source fields of interest, resulting low spatial resolution. Inaccuracies in atomic positioning give rise to additional uncertainty when in measurements, such as the Newtonian gravitational constant G. To address this problem, we intend to utilize a dipole trap within hollow-core fiber for cold atoms confinement, this will allow atoms to be enclosed within millimeter range and spatial resolution. Furthermore, we include a simplified one-beam MOT using conical-shaped mirror, reducing the complexity typically associated with conventional 3D magneto-optical traps. In this presentation, we will introduce the experimental methodology and hardware configuration, followed by a discussion of our latest results and ongoing progress.