| Zugriffsnummer | 29280 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | International timescales with optical clocks [poster] |
| Autor(in); Institution |
Margolis, Helen S.; National Physical Laboratory (NPL), Teddington, UK
Godun, Rachel M.; National Physical Laboratory (NPL), Teddington, UK
Gill, Patrick; National Physical Laboratory (NPL), Teddington, UK
Johnson, Luke A. M.; National Physical Laboratory (NPL), Teddington, UK
Shemar, Setnam L.; National Physical Laboratory (NPL), Teddington, UK
Whibberley, Peter B.; National Physical Laboratory (NPL), Teddington, UK
Calonico, Davide; Istituto Nazionale di Ricerca Metrologica (INRIM), Torino, ITALY
Levi, Filippo; Istituto Nazionale di Ricerca Metrologica (INRIM), Torino, ITALY
Lorini, Luca; Istituto Nazionale di Ricerca Metrologica (INRIM), Torino, ITALY
Pizzocaro, Marco; Istituto Nazionale di Ricerca Metrologica (INRIM), Torino, ITALY
Delva, Pacome; LNE-SYRTE, Observatoire de Paris, UPMC, Paris, FRANCE
Bize, Sebastien; LNE-SYRTE, Observatoire de Paris, UPMC, Paris, FRANCE
Achkar, Joseph; LNE-SYRTE, Observatoire de Paris, UPMC, Paris, FRANCE
Denker, Heiner; Leibniz Universität, Institut für Erdmessung (IfE), Hannover, GERMANY
Timmen, Ludger; Leibniz Universität, Institut für Erdmessung (IfE), Hannover, GERMANY
Voigt, Christian; Leibniz Universität, Institut für Erdmessung (IfE), Hannover, GERMANY
Falke, Stephan; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Piester, Dirk; 4.4, Zeit und Frequenz, PTB-Braunschweig
Lisdat, Christian; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Sterr, Uwe; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Vogt, Stefan; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Weyers, Stefan; 4.4, Zeit und Frequenz, PTB-Braunschweig
Gerstl, Jan; Cesky Metrologicky Institut (CMI), Brno, CZECH REPUBLIC
Lindvall, Thomas; Mittatekniikan Keskus (MIKES), Espoo, FINLAND
Merimaa, Mikko; Mittatekniikan Keskus (MIKES), Espoo, FINLAND
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| Quelle/Jahr | 2013 Joint UFFC, EFTF and PFM Symposium:(2013), 908 - 911 |
| Availability | [DVD-ROM] ; file name: UFFC2013-001265.pdf |
| ISBN | 978-1-4673-5686-2 ; 978-1-4799-0341-2 |
| Verlag | Piscataway, NJ: IEEE |
| Konferenzangaben | EFTF 2013 (Joint UFFC, EFTF and PFM Symposium), Prague, 21-25, July, 2013, Czech Republic |
| Zusammenfassung | The most advanced optical atomic clocks have now reached levels of stability and accuracy that significantly surpass the performance of the bestcaesium primary frequency standards. As a result, the possibility of a future redefinition of the second in terms of an optical transition frequency is being actively considered by the international metrology community. A new project funded within the European Metrology Research Programme (EMRP) aims to tackle the key challenges that must be addressed before an optical redefinition of the second can be implemented. A coordinated programme of European clock comparisons will be carried out at a level limited only by the accuracies of the clocks themselves, using transportable optical clocks, broad bandwidth satellite links and optical fibre links. Such a comparison programme is required to validate the performance levels of the optical clocks, to anchor their frequencies to the present definition of the second with the lowest possible uncertainty, and to establish the leading contenders for a new definition of the second. To support the comparison programme, a complete evaluation will be made of all relativistic effects influencing time and frequency comparisons at the 10-18 level of accuracy, including the gravitational redshifts of the clock transition frequencies. Significant effort will be devoted to the design of setups to determine the static gravity potential at each clock location and the development of a refined geoid model incorporating gravity observations around each clock site. The overall objective of the project is to develop a framework and procedures whereby the new generation of optical clocks can be integrated into international timescales, providing input to the Consultative Committee for Time and Frequency (CCTF) to prepare for a future redefinition of the second. The potential impact that high accuracy optical clocks could have on the field of geodesy will also be demonstrated, by carrying out a proof-of-principle experiment using optical clocks to measure with high temporal resolution the gravity potential difference between two well-defined locations separated by a long baseline ( ≈90 km) and a height difference of 1000 m. |
Zitierung
Margolis, H. S., Godun, R. M., Gill, P., Johnson, L. A. M., Shemar, S. L., Whibberley, P. B., Calonico, D., Levi, F., Lorini, L., Pizzocaro, M., Delva, P., Bize, S., Achkar, J., Denker, H., Timmen, L., Voigt, C., Falke, S., Piester, D., Lisdat, C., Sterr, U., Vogt, S., Weyers, S., Gerstl, J., Lindvall, T., & Merimaa, M. (2013). International timescales with optical clocks [poster]. EFTF 2013 (Joint UFFC, EFTF and PFM Symposium), Prague, 21-25, July, 2013, Czech Republic.