![]() 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. But before such a redefinition is possible, scientists must build confidence in the reproducibility of optical clocks through a series of clock comparisons. 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. Such optical clocks would be 100 times more accurate than caesium clocks. ![]() 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. ![]() 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. Each tick quantifies intervals of time so well that one. Three of the world(TM)s best optical clocks are the aluminium-ion and ytterbium clocks at NIST and the strontium clock at JILA. Comparing two optical lattice ytterbium clocks together, the researchers found something astounding. Clocks based on different atoms run at different rates, and the term 'optical clock' refers to one that runs at an optical frequency. 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. 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). 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 remarkable accuracy of atomic clocks makes them excellent instruments for timekeeping and other precision measurements. Stay informed about all things NPL via our email communication, Measure Up.#Themainevent22 Began With A Valentines Day Prank! Enjoy Naima & Akins White Wedding Photos - BellanaijaĢ023 BET Awards: Burna Boy Becomes First African To Win The Best International Act Four Times - ToriĢ023 BET Awards: Burna Boy becomes first African to win the Best International Act four times - Linda IkejiĢ023 BET Awards: Burna Boy Wins Best International Act as Tems Wins Best Collaboration - GistloverĢ023 BET Awards: Davido lights up stage with electrifying performance - GistloverĢ023 BET Awards: Davido Lights Up Stage with His Energetic Performance - GistloverĢ023 Poll: HURIWA Urges President Tinubu To 'Suspend INEC Chairman - Information NigeriaĢ4-year-old man behind massive hack of celebrity Twitter accounts including Barack Obama, Joe Biden, Kim Kardashian and Elon Musk is jailed for five years - Linda IkejiĢ4-year-old Who Hacked Celebrity Twitter Accounts Including Barack Obama, Joe Biden, Kim Kardashian and Elon Musk Is Jailed (Photo) - Tori Click to view all Entertainment headlines today And with the current accuracy limits being set by technical issues, rather than fundamental limits, the prospects for even better measurements in the future are extremely promising.” Regardless of the application - whether in redefining the SI second, surveying or fundamental physics - the better the clock comparisons, the greater the impact. Atomic clocks compared with astounding accuracy Three atomic clocks based on different atoms have been compared with record accuracy. “Networks of optical clocks can also be used to explore many other aspects of physics, because their precision allows measurements of the world around us to be obtained at unprecedented resolution.”Įxamples of such investigations include testing Einstein’s theory of relativity at ever more stringent levels and searching for possible changes in the values of physical constants. The 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 remarkable accuracy of atomic clocks makes them excellent instruments for timekeeping and other precision measurements. ![]()
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