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By bouncing a laser off a mirror, they're able "to create a standing wave of light which forms a lattice to trap atoms. This is a kind of eggbox in which the atoms sit." With the ytterbium atoms neatly trapped, the clock is free to zap them with a different laser and measure the electrons' frequencies. Leaving you with a clock that will only lose about one second avery 31 billion years. Not bad.
En sekund på 31 miljarder år... Svårslaget!