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March 25, 2021 06:00 pm
Original Link: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/TStLI3GM_oc/atomic-clocks-compared-with-astounding-accuracy
Atomic Clocks Compared With Astounding Accuracy
The remarkable accuracy of atomic clocks makes them excellent instruments for timekeeping and other precision measurements. From a report: Writing in Nature, the Boulder Atomic Clock Optical Network (BACON) Collaboration reports extremely accurate comparisons of three world-leading clocks in Boulder, Colorado, housed at the National Institute of Standards and Technology (NIST) and the JILA research institute. The authors show how their clock comparisons provide insights into fundamental physics and represent substantial progress towards redefining the second in the International System of Units (SI). Atomic clocks 'tick' at a rate determined by the frequency of light that is emitted or absorbed when an atom changes from one energy state to another. Clocks based on different atoms run at different rates, and the term 'optical clock' refers to one that runs at an optical frequency. Three of the worldâ(TM)s best optical clocks are the aluminium-ion and ytterbium clocks at NIST and the strontium clock at JILA. The measured frequencies of all three clocks are estimated to be correct to within a fractional uncertainty of 2 parts in 10^18 or better. This level of uncertainty could, in principle, allow the clocks to keep time so accurately that they would gain or lose no more than one second over the age of the Universe. Such optical clocks would be 100 times more accurate than caesium clocks. There is therefore a desire to redefine the SI second in terms of an optical-clock frequency and to move away from the current definition based on caesium. But before such a redefinition is possible, scientists must build confidence in the reproducibility of optical clocks through a series of clock comparisons. The target accuracy for these comparisons is at the level of parts in 10^18 to clearly demonstrate the superiority of optical clocks over caesium clocks.Read more of this story at Slashdot.
Original Link: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/TStLI3GM_oc/atomic-clocks-compared-with-astounding-accuracy
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