After an earthquake, a building’s steel skeleton becomes an invisible compass: every beam leaves a magnetic trace. Send in a drone with a quantum ‘nose,’ and it sketches a map of voids in the debris more precisely than any X-ray, in minutes. A digital model of a parking garage proved just a hundred scans can cover a whole floor.
🎯 Ordinary magnetometers in smartphones sense fields hundreds of times stronger than Earth's magnetic field, while quantum sensors detect changes a billion times weaker—down to the level of the human heart's magnetic field.
🎬 The technology is akin to the tricorders from Star Trek—devices that scan through obstacles for signs of life.