Hyperfine qubits are extremely long-lived ( decay time of the order of thousands to millions of years ) and phase / frequency stable ( traditionally used for atomic frequency standards ).
2.
Curiously enough, it refers to the " M "-sample variance as " Allan variance " while referencing to Allan's paper " Statistics of Atomic Frequency Standards ".
3.
In 1956, the U . S . National Bureau of Standards and U . S . Naval Observatory started to develop atomic frequency time scales; by 1959, these time scales were used in generating the WWV time signals, named for the shortwave radio station that broadcasts them.
4.
Because Universal Time is synchronous with night and day, and more precise atomic-frequency standards drift away from this, however, UT is still used to produce a correction ( called a leap second ) to atomic time, in order to obtain a broadcast form of civil time that carries atomic frequency.
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The rare-earth element ytterbium ( Yb ) is valued not so much for its mechanical properties but for its complement of internal energy levels . " A particular transition in Yb atoms, at a wavelength of 578 nm, currently provides one of the world's most accurate optical atomic frequency standards, " said Marianna Safronova.
6.
However, the US Naval Observatory reports it is named after Gernot M . R . Winkler, who worked there between 1966 and 1995 and was awarded the 1988 I . I . Rabi Award for his " early development of worldwide clock synchronization through use of portable clocks; encouragement and support for the development of atomic frequency standards from their earliest days; and international leadership in the time and frequency community ."
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