Publication Date:
2008-02-16
Description:
Optical atomic clocks promise timekeeping at the highest precision and accuracy, owing to their high operating frequencies. Rigorous evaluations of these clocks require direct comparisons between them. We have realized a high-performance remote comparison of optical clocks over kilometer-scale urban distances, a key step for development, dissemination, and application of these optical standards. Through this remote comparison and a proper design of lattice-confined neutral atoms for clock operation, we evaluate the uncertainty of a strontium (Sr) optical lattice clock at the 1 x 10(-16) fractional level, surpassing the current best evaluations of cesium (Cs) primary standards. We also report on the observation of density-dependent effects in the spin-polarized fermionic sample and discuss the current limiting effect of blackbody radiation-induced frequency shifts.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ludlow, A D -- Zelevinsky, T -- Campbell, G K -- Blatt, S -- Boyd, M M -- de Miranda, M H G -- Martin, M J -- Thomsen, J W -- Foreman, S M -- Ye, Jun -- Fortier, T M -- Stalnaker, J E -- Diddams, S A -- Le Coq, Y -- Barber, Z W -- Poli, N -- Lemke, N D -- Beck, K M -- Oates, C W -- New York, N.Y. -- Science. 2008 Mar 28;319(5871):1805-8. doi: 10.1126/science.1153341. Epub 2008 Feb 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉JILA, National Institute of Standards and Technology, and University of Colorado, Department of Physics, University of Colorado, Boulder, CO 80309-0440, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18276849" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
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Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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