Japan Builds Quantum Sensors for Drones

Japan is developing compact quantum magnetic sensors that fit on drones to spot hidden submarines underwater.

These sensors catch tiny changes in the Earth's magnetic field caused by metal hulls. Standard radars cannot see deep beneath the waves, but magnetic fields pass right through. Mounting these devices on flying machines lets operators scan vast ocean areas much faster.

This setup gives maritime defense teams a practical way to track underwater targets from the air.

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