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出典:『Wikipedia』 (2011/04/24 17:57 UTC 版)

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A quantum clock is a type of clock that confines aluminum and beryllium ions together in an electromagnetic trap and cools them by lasers to near absolute zero temperatures. Developed by National Institute of Standards and Technology physicists, the clock is 37 times more precise than the existing international standard. Both the aluminum based Quantum Clock and the mercury based atomic clock keep track of time from the ion vibration at an optical frequency by using a UV laser, that is 100,000 times higher than the microwave frequencies used in NIST-F1 and other similar time standards around the world. Quantum clocks like this are able to divide time into smaller units and can be far more precise than microwave standards.