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science7h ago
Chinese scientists create clock so precise it could redefine second
Independent.co.uk and 1 more
- Chinese researchers report an optical clock so precise it could redefine the SI second.
- The clock measures time by the frequency of light from atomic transitions to extreme precision.
- The advancement could enable new gravity and deformation measurements on Earth.
- Researchers suggest optical clocks may aid dark matter searches with high precision timing.
- At least three optical clocks are needed at different institutions to redefine the second.
- Two other optical clocks have already met the milestone, paving the way for collaboration.
- The defining of the second currently relies on cesium-133 atomic transitions.
- Ultra-precise clocks could enable high-resolution measurements of volcanic activity and groundwater changes.
- The research was published in the journal Metrologia.
- The International System of Units currently defines the second by cesium-133 oscillations.
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