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Nature 435, 291 (19 May 2005) | doi:10.1038/435291a; Published online 18 May 2005
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Timekeeping: Light-insensitive optical clock
Thomas Udem1
Abstract
Interactions between trapped neutral atoms have prevented their use as the ultimate frequency standard in optical clocks. A clever trapping scheme circumvents this problem and may push timekeeping to new limits.
Almost all clocks consist of two essential parts: an oscillator with periodically occurring events, and a counter to keep track of those events. For example sundials, the oldest known clocks, use Earth's rotation as the oscillator and a human as the counter.
- Thomas Udem is at the Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany.
Email: thomas.udem@mpq.mpg.de
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