Publication Date:
2012-04-28
Description:
Optical clocks show unprecedented accuracy, surpassing that of previously available clock systems by more than one order of magnitude. Precise intercomparisons will enable a variety of experiments, including tests of fundamental quantum physics and cosmology and applications in geodesy and navigation. Well-established, satellite-based techniques for microwave dissemination are not adequate to compare optical clocks. Here, we present phase-stabilized distribution of an optical frequency over 920 kilometers of telecommunication fiber. We used two antiparallel fiber links to determine their fractional frequency instability (modified Allan deviation) to 5 x 10(-15) in a 1-second integration time, reaching 10(-18) in less than 1000 seconds. For long integration times tau, the deviation from the expected frequency value has been constrained to within 4 x 10(-19). The link may serve as part of a Europe-wide optical frequency dissemination network.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Predehl, K -- Grosche, G -- Raupach, S M F -- Droste, S -- Terra, O -- Alnis, J -- Legero, Th -- Hansch, T W -- Udem, Th -- Holzwarth, R -- Schnatz, H -- New York, N.Y. -- Science. 2012 Apr 27;336(6080):441-4. doi: 10.1126/science.1218442.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max-Planck-Institut fur Quantenoptik, Garching, Germany. kdp@mpq.mpg.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22539714" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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