Superradiant atomic clock revival

Researchers propose making a continuous superradiant laser—an atomic clock that stores coherence in atoms rather than a cavity—by adding a third ground state to avoid heating that previously forced only pulsed operation. That modification could produce an optical output with an ultra‑narrow linewidth (~100 microhertz), much less sensitive to environmental noise. — If realized, such clocks would upgrade national and commercial timing infrastructure and boost ultra‑precise measurement tools used in navigation, communications, geodesy, and fundamental‑physics searches.