期刊
SCIENCE
卷 331, 期 6020, 页码 1043-1046出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1196442
关键词
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资金
- National Research Council
- National Defense Science and Engineering Graduate fellowship
- Army Research Office
- Defense Advanced Research Projects Agency
- National Institute of Standards and Technology
- NSF Physics Frontier Center at JILA
- Air Force Office of Scientific Research
- Direct For Mathematical & Physical Scien
- Division Of Physics [0904017] Funding Source: National Science Foundation
Optical lattice clocks with extremely stable frequency are possible when many atoms are interrogated simultaneously, but this precision may come at the cost of systematic inaccuracy resulting from atomic interactions. Density-dependent frequency shifts can occur even in a clock that uses fermionic atoms if they are subject to inhomogeneous optical excitation. However, sufficiently strong interactions can suppress collisional shifts in lattice sites containing more than one atom. We demonstrated the effectiveness of this approach with a strontium lattice clock by reducing both the collisional frequency shift and its uncertainty to the level of 10(-17). This result eliminates the compromise between precision and accuracy in a many-particle system; both will continue to improve as the number of particles increases.
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