Compact cold-atom platform based on optical grating and planar coil chips

We present a compact cold atom platform where an optical grating chip and planar coil chip are placed inside a compact vacuum chamber to create a magneto-optical trap. This approach significantly reduces the system volume to about 20 × 20 × 20cm³ compared to conventional vacuum systems and offers greater flexibility in accessing the trapped atoms. We demonstrate the trapping of 3 × 10⁵ cold Rubidium atoms at a temperature of 100μK in a vacuum pressure below 10^-7 mbar. The simplified optical geometry, low power consumption, and high degree of integration make this a promising platform for portable and versatile cold-atom devices in quantum sensing, timing, and information processing.