"ALGORITHMS: Strontium scheme enters atomic clock race"

A candidate to be the next-generation atomic clock is based on the heavy metal strontium and uses a laser lattice to suspend super-cooled atoms. The result was a 430-THz time base—40,000 times faster than the current 9.19-GHz cesium-based atomic clocks. The strontium-based clock was demonstrated recently by the Commerce Department's National Institute of Standards and Technology (NIST) with help from the University of Colorado at Boulder and JILA (formerly the Joint Institute for Laboratory Astrophysics).
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