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A strontium lattice clock with 3 × 10−17 inaccuracy and its frequency.
- Source :
- New Journal of Physics; Jul2014, Vol. 16 Issue 7, p1-1, 1p
- Publication Year :
- 2014
-
Abstract
- We have measured the absolute frequency of the optical lattice clock based on <superscript>87</superscript>Sr at PTB with an uncertainty of 3.9 × 10<superscript>−16</superscript> using two caesium fountain clocks. This is close to the accuracy of todayʼs best realizations of the SI second. The absolute frequency of the 5 s<superscript>2 1</superscript>S<subscript>0</subscript> – 5s5p <superscript>3</superscript>P<subscript>0</subscript> transition in <superscript>87</superscript>Sr is 429 228 004 229 873.13(17) Hz. Our result is in excellent agreement with recent measurements performed in different laboratories worldwide. We improved the total systematic uncertainty of our Sr frequency standard by a factor of five and reach 3 × 10<superscript>−17</superscript>, opening new prospects for frequency ratio measurements between optical clocks for fundamental research, geodesy or optical clock evaluation. [ABSTRACT FROM AUTHOR]
- Subjects :
- STRONTIUM
LATTICE theory
CESIUM
GEODESY
LIGHT metals
Subjects
Details
- Language :
- English
- ISSN :
- 13672630
- Volume :
- 16
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- New Journal of Physics
- Publication Type :
- Academic Journal
- Accession number :
- 97264356
- Full Text :
- https://doi.org/10.1088/1367-2630/16/7/073023