The system, called the Coherent Population Trapping (CPT) atomic magnetometer, leverages quantum interference effects in rubidium atoms. According to the SCMP post, it exploits Zeeman splitting, which refers to shifts in energy levels caused by magnetic fields. This generates seven microwave resonance signals.
These frequencies are not weakened by alignment with the Earth’s magnetic field lines, the researchers explained in their paper published in the Chinese Journal of Scientific Instrument.
Extreme precision during trials
The new CPT system is reportedly on par with Canada’s MAD-XR system. MAD-XR is widely used by NATO forces. However, the team behind the new CPT advance claims their system is much more affordable.