[time-nuts] NPR: Researchers Are One Step Closer To Redefining The Second

[Hal Murray]

https://www.npr.org/2021/03/29/982417680/researchers-are-one-step-closer-to-red
efining-the-second
Audio is 2:54

Researchers with the Boulder Atomic Clock Optical Network Collaboration are 
one step closer to replacing the current atomic clock and officially 
redefining the second.


KENNEDY: Ultimately, the goal is to redefine the second in terms of a more 
accurate and more precise standard.

SHAPIRO: Kennedy, Ye and their colleagues compared three of those 
next-generation atomic clocks, which use atoms of aluminum, strontium or 
ytterbium.

CHANG: The goal was not to see which atomic clock was the best ticker per se 
but to show that these types of clocks can be compared from one lab to 
another, perhaps from one country to another.

KENNEDY: We want to make sure that a clock built here in Boulder is the same 
as a clock built in Paris as in London as in Tokyo.

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