Journal
SCIENCE
Volume 306, Issue 5700, Pages 1318-1324Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1102330
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After 50 years of development, microwave atomic clocks based on cesium have achieved fractional uncertainties below 1 part in 10(15), a level unequaled in all of metrology. The past 5 years have seen the accelerated development of optical atomic clocks, which may enable even greater improvements in timekeeping. Time and frequency standards with various levels of performance are ubiquitous in our society, with applications in many technological fields as well as in the continued exploration of the frontiers of basic science. We review state-of-the-art atomic time and frequency standards and discuss some of their uses in science and technology.
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