Chinese Researchers Claim Compact Quantum Magnetometer Can Detect Concealed Objects in Field Trials

Overview: Chinese researchers have crafted a compact quantum magnetometer capable of detecting underground train activity, locating buried magnets, and monitoring geomagnetic storms during field tests.
Design Features: The device features a 7-cubic-centimeter sensing probe, which automatically restores measurements within a second after any strong magnetic interference.
Applications: This technology could facilitate mineral exploration, environmental monitoring, and searches for unexploded ordnance.

Field Tests: The magnetometer detected underground train activities and showcased its potential for geological surveys and defense applications.
Research Background: The development is a collaboration involving the University of Science and Technology of China, Hefei National Laboratory, and China State Shipbuilding Corp.

Operational Characteristics: In laboratory conditions, the magnetometer exhibited remarkable sensitivity, detecting noise levels several million times smaller than the background magnetic field.
Measurement Method: It operates using rubidium atoms and laser technology to measure changes in magnetic fields, adjusting the signal in real-time for accurate data capture.
Device Dimensions: The probe’s compact design includes critical components such as optical elements and radio-frequency coils, maintaining a steady operational power consumption.

The design allows the device to recover measurement capability promptly after disruptions due to environmental changes.
Tests indicated a quick recovery within a second after interference, improving operational reliability.

Geomagnetic Monitoring: Successfully recorded a severe geomagnetic storm, validating the device’s performance against established observatories.
Subway Detection: Recorded significant magnetic changes due to underground train operations, though it did not confirm operational ranges for detection.
Buried Object Detection: Effectively located a buried magnet, suggesting utility for portable magnetic surveys.

There are plans for further research into enhancing the sensor’s measurement capabilities and bandwidth expansion using innovative techniques.
Potential commercial applications include geomagnetic monitoring networks, traffic sensing, and underground infrastructure surveys for mineral or military purposes.