Chinese Scientists Say Compact Quantum Magnetometer Tracks Hidden Targets in Field Tests

Insider Brief

• Chinese researchers developed a compact quantum magnetometer that detected underground train activity, located a buried magnet and monitored a geomagnetic storm in field tests.
• The instrument uses a 7-cubic-centimeter sensing probe and automatically restores measurements within a second after strong magnetic interference is removed.
• The findings suggest the system could support mineral exploration, environmental monitoring and searches for unexploded ordnance.
• Image: Schematic diagram and photograph of the miniaturized magnetometer system from the study.

Chinese researchers developed a compact quantum magnetometer that detected underground train activity, located a buried magnet and monitored a geomagnetic storm in field tests.

The instrument uses a small sensing probe — about the the size of two dice placed side by side — and automatically restores measurements within a second after strong magnetic interference is removed.

In the study, the researchers’ compact quantum magnetometer — with separate electronics controls — detected underground train activity and located a buried magnet, demonstrating capabilities that could support geological surveys and searches for concealed objects with potential defense applications.