China’s gravity-detecting SQUID gets closer to spotting US nuclear submarines
A new office-sized device achieves world-leading precision in measuring tiny gravitational shifts.
A team from the Chinese Academy of Sciences (CAS) has developed a groundbreaking gravity gradient detector using a superconducting quantum interference device (SQUID). The key achievement is its exceptional precision: the instrument reduces measurement noise to a level comparable only to massive scientific installations like the 4km-long Laser Interferometer Gravitational-Wave Observatory (LIGO). Remarkably, it achieves this sensitivity in a compact, office cubicle-sized package, making it far more practical for field deployment than previous lab-bound systems.
This leap in portable, high-precision gravity measurement has significant dual-use implications. While the researchers cite applications in scientific research and locating underground resources, the technology's primary strategic value lies in military detection. Unlike sonar, magnetic anomaly detection, or radar—all of which can be countered—an object's gravitational influence cannot be masked. This brings China closer to a capability for detecting stealthy assets, particularly patrolling nuclear submarines, by identifying the tiny distortions in Earth's gravitational field they produce.
- Developed by CAS, the SQUID-based device reduces gravity gradient noise to a level second only to kilometer-scale observatories like LIGO.
- The instrument is compact, roughly the size of an office cubicle, enabling use outside specialized laboratory environments.
- It detects objects via unmaskable gravitational shifts, advancing potential military applications for spotting stealth submarines.
Why It Matters
This represents a strategic leap in undersea detection technology, potentially undermining traditional stealth advantages in naval warfare.