Comparison With an Uncertainty of 2×10-16 Between Two Primary Frequency Standards

Cipriana Mandache, C. Vian, P. Rosenbusch, H. Marion, Ph. Laurent, G. Santarelli, S. Bize, A. Clairon, A.N. Luiten, M.E. Tobar, C. Salomon

Abstract:	We present a comparison between SYRTE’s Cs fountain FO1 and Cs-Rb fountain FO2 using a cryogenic sapphire oscillator (CSO) to generate an ultra-stable interrogation signal. A description of the experimental setup is given and the clock accuracies are discussed. For the first time, a frequency resolution in the low 10-16 is achieved in the comparison between two primary standards. The paper also summarizes recent contributions of these fountains to research activities such as test of the stability of fundamental constants, timekeeping and test of sub-systems of the PHARAO space clock.
Published in:	Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting August 29 - 31, 2005 Vancouver, Canada
Pages:	93 - 98
Cite this article:	Mandache, Cipriana, Vian, C., Rosenbusch, P., Marion, H., Laurent, Ph., Santarelli, G., Bize, S., Clairon, A., Luiten, A.N., Tobar, M.E., Salomon, C., "Comparison With an Uncertainty of 2×10-16 Between Two Primary Frequency Standards," Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting, Vancouver, Canada, August 2005, pp. 93-98.
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