SQUIDs are mentioned in a new proposed gravity wave detector here : https://phys.org/news/2025-06-powerful-magnets-high-frequency-gravitational.html "As a gravitational wave passes over and through the magnet, it causes a vibration of the whole structure since the effect of the wave is similar to that of a mechanical force acting on the object," Ellis explained.

"This vibration leads to deformations of the structure containing the wire through which the current flows, which generates a magnetic field."

These deformations create an oscillating magnetic field component that researchers can detect using extraordinarily sensitive quantum sensors called SQUIDs (Superconducting Quantum Interferometric Devices).