A new dimension in precision time-keeping
Researchers at the National Metrology Institute of Germany (PTB) have built an optical single-ion atomic clock that is particularly accurate.

Researchers at the National Metrology Institute of Germany (PTB) have won a special race against time. They have built an optical single-ion atomic clock – one of only a few in the world and the most accurate of its kind. The clock could make satellite navigation more precise, for example, and provide new insights into the world of physics.