We took an insanely precise atomic clock out on a boat and it actually kept perfect time even while being tossed around by the waves.
March 27, 2026
Original Paper
Portable laser-cooled ytterbium beam clock based on an ultra-narrow optical transition
arXiv · 2603.25261
The Takeaway
Optical atomic clocks are usually so fragile they require isolated, vibration-free laboratories to function. This team managed to shrink the tech and make it robust enough to maintain near-perfect time while sailing, which is a massive step toward navigation systems that don't rely on GPS satellites.
From the abstract
The highest performance atomic clocks are based on interrogation of ultra-narrow optical transitions. There is now significant interest in developing these systems as a source of GNSS-independent time in deployed, dynamic environments. We report on the development and field trial of a portable optical atomic clock interrogating the 10mHz wide $^1$S$_0\rightarrow ^3$P$_0$ transition in ytterbium-171. To enable measurement of this ultra-narrow transition in a deployed setting we combine an atom-va