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This breakthrough resolves long-standing discrepancies in optical lattice clocks by accounting for trap-drive induced magnetic fields, establishing a new standard for the definition of the second. The resulting precision, equivalent to losing less than one second every three million years, advances fundamental quantum metrology and could enhance global navigation satellite systems through more accurate time synchronization.
Researchers Measure Calcium Clock Frequency with 0.6Hz Uncertainty
A discrepancy of one part in a million has now been resolved in measurements defining the second itself. Previous calcium ion clock readings from 2009, 2012 were inconsistent with more recent data until trap-drive induced magnetic fields were accounted for, yielding a refined Landé g-factor of 1. 200329±0.
The absolute frequency of the $4s ^2’S1/2leftrightarrow 3d ^2’D5/2 clock transition in trapped calcium ions has been measured using a Global Navigation Satellite System link to Coordinated Universal Time. Previous measurements dating back to 2009 contained inconsistencies, but a precise frequency of 411 042 129 776 401.2 Hertz with an uncertainty of one and half parts per ten quintillion is now established. Researchers refined understanding of time measurement utilising a calcium ion clock,…
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