China develops 40-gram cold-atom atomic clock for compact systems

40-gram cold-atom atomic clock designed for compact systems requiring highly accurate timing

Chinese researchers have created the world’s smallest atomic clock, intended for drones and other space-constrained equipment. Weighing roughly 40 grams, the device occupies a volume similar to that of a small electronic module. Its accuracy is comparable with laboratory reference standards, while using considerably less power and operating independently.

Cold-atom technology for precise timing

The development uses cold-atom technology. Lasers cool the atoms, while their quantum transitions are measured to stabilise the frequency. This method delivers stable performance and reduces the impact of external interference, which is essential for navigation, communications and other applications that depend on precise timing.

Compact design for drones and autonomous systems

According to the authors, miniaturisation was made possible by integrating every key component into a compact housing and refining the control algorithms. As a result, the device can be fitted into drones, satellites, autonomous robots and other systems in which weight and physical dimensions are important.

The project was carried out under China’s state programme for developing high-precision instruments. The technology has already undergone laboratory testing, with commercial deployment and mass production planned for the future.