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Atomic clock with best long term accuracy

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The world’s most accurate clock is now a cesium fountain clock in England. A collaboration between the Krzysztof Szymaniec at the National Physical Laboratory and Kurt Gibble’s group at Penn State has improved it’s accuracy by nearly a factor of 2, to 2.3 parts in 10^16 – better than a second in 140 million years. Their advances are being applied to other clocks around the world to substantially improve International Atomic Time.