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Long term measurement of the 87Sr clock frequency at the limit of primary Cs clocks.

27.08.2020

This paper reports on measurements of the transition frequency of a strontium-87 lattice clock with a record uncertainty of 1.5×10⁻¹⁶, by using two local caesium fountain clocks. This result is an important contribution to the decision processes concerning a redefinition of the SI base unit second based on optical clocks. With data spanning three years of observation, the authors set more stringent limits to the coupling of fundamental constants to the gravitational potential.

Authors:

Schwarz, Roman; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Dörscher, Sören; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Al-Masoudi, A.
Benkler, Erik; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Legero, Thomas; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Sterr, Uwe; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Weyers, Stefan; 4.4, Zeit und Frequenz, PTB-Braunschweig
Rahm, Johannes; 4.4, Zeit und Frequenz, PTB-Braunschweig
Lipphardt, Burghard; 4.4, Zeit und Frequenz, PTB-Braunschweig
Lisdat, Christian; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig

 

for further information:

Opens external link in new windowLong term measurement of the 87Sr clock frequency at the limit of primary Cs clocks
R. Schwarz, S. Dörscher, A. Al-Masoudi, E. Benkler, T. Legero, U. Sterr, S. Weyers, J. Rahm, B. Lipphardt, and C. Lisdat
Phys. Rev. Research 2, 033242 – Published 11 August 2020