On April 15, Australian researchers tested a new portable atomic clock at sea for the first time. This technology is expected to provide critical support for next-generation navigation, communication, and scientific systems. The research was conducted by a team from the Institute for Photonics and Advanced Sensing at the University of Adelaide, with relevant findings published in the latest issue of Optica journal.
Atomic clocks are currently the most precise timekeeping devices in the world and form the foundation for systems such as GPS navigation, telecommunications networks, and radio astronomy. However, most high-performance atomic clocks need to operate in strictly controlled laboratory environments, making them difficult to transport and unsuitable for complex, variable real-world conditions. The newly developed device aims to change this situation.
The device is based on laser-cooled ytterbium atoms and achieves high-precision timekeeping by measuring the frequency of specific atomic transitions. Compared to traditional atomic clocks, it offers higher accuracy while being movable and capable of operating in non-ideal environments.
To verify its performance, the research team transported the device to a ship provided by the Royal Australian Navy in July 2024, where it operated continuously at sea for several days. The results showed that, even in complex marine environments with vibration, motion, and temperature changes, the atomic clock maintained the same high performance as in laboratory tests. According to the report, this marks the first time a laser-cooled optical atomic clock has been validated for operation at sea.
André Luiten, project lead and Chief Innovation Officer at the Institute for Photonics and Advanced Sensing, stated that testing the atomic clock on a ship is a significant milestone. The vibrations, motion, and temperature variations in the marine environment are vastly different from those in a laboratory. Being able to operate stably under such conditions indicates that this technology is ready for practical applications.
Due to its immense application potential, portable atomic clocks are attracting global attention. In navigation, such high-precision clocks could support positioning systems that continue to function even when satellite signals are limited or disrupted; in communications, they can enhance the synchronization capability of large-scale data transmission networks; in radio astronomy, high-precision timekeeping helps achieve precise coordination of observational data from telescopes worldwide.
Currently, the research team is further optimizing this technology and plans to conduct more field tests to promote the application of ultra-high-precision portable atomic clocks in fields such as scientific research, commerce, and national defense in the coming years.