caesium clock

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an atomic clock based on the energy difference between two states of the caesium nucleus in a magnetic field

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The main improvement in caesium clock accuracy has been achieved through the use of laser-cooled caesium atoms in laboratory clocks known as 'caesium fountains'.
Since 1983 we have referred length to a combination of velocity and time, time already being defined, as stated above, in terms of the caesium atom, and the velocity of light now being defined as exactly 299,792,458 metres per second, so that today we say that one metre is exactly 1/299,792,458 of the distance that light travels in 9,192,631,770 ticks of our caesium clock (if that clock is keeping good time .
That our provisionally trusty caesium clock should not, in certain well-defined senses, keep good time is indeed expected and well understood.
The research has also led to the construction of extremely precise clocks that could become the future basis for a new standard of time, with more than hundred-fold greater precision than present-day caesium clocks, it said.
Now, these previous competitors can complement one another, and the technology of the optical clock leads to a considerable improvement of the established caesium clocks.