Scientists who work on atomic clocks believe that they will be able one day to put up a network of quantum-entangled atomic clocks in orbit as a kind of ultra-G

Scientists who work on atomic clocks believe that they will be able one day to put up a network of quantum-entangled atomic clocks in orbit as a kind of ultra-GPS. According to an article[1] I read, they should be able to gravimetrically image the volume of earth to within about a cubic centimeter resolution. At that point it becomes very hard to hide high-density materials, like concentrations of U or Pu, anywhere. [1] https://www.sciencenews.org/article/quantum-timekeeping https://www.sciencenews.org/article/quantum-timekeeping