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+ - Most Accurate Clock->

Submitted by Anonymous Coward
An anonymous reader writes "An optical clock that is twice as accurate as any other has been unveiled by physicists in the US. The clock, which is based on a singlealuminium ion, could remain accurate to within one second over 3.7 billion years. The previous record was held by a clock with onemercury ion, which was good to one second in 1.7 billion years.This clock usee a different principle quantum-interference protocol which makes it more accurate."
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Most Accurate Clock

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