Absolute frequency measurement of the 2 S 1/2 → 2 F 7/2 optical clock transition in 171 Yb+ with an uncertainty of 4 x 10 -16 using a frequency link to international atomic time
Date
2018
Authors
Baynham, C.
Godun, R.
Jones, J.
King, S.
Nisbet-Jones, P.
Baynes, F.
Rolland, A.
Baird, P.
Bongs, K.
Gill, P.
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Journal article
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Journal of Modern Optics, 2018; 65(5-6):585-591
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Charles F. A. Baynham, Rachel M. Godun, Jonathan M. Jones, Steven A. King, Peter B. R. Nisbet-Jones, Fred Baynes ... et al.
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Abstract
The highly forbidden 2S1/2→2F7/2 electric octupole transition in 171Yb+ is a potential candidate for a redefinition of the SI second. We present a measurement of the absolute frequency of this optical transition, performed using a frequency link to International Atomic Time to provide traceability to the SI second. The 171Yb+ optical frequency standard was operated for 76% of a 25-day period, with the absolute frequency measured to be 642 121 496 772 645.14(26) Hz. The fractional uncertainty of 4.0×10−16 is comparable to that of the best previously reported measurement, which was made by a direct comparison to local caesium primary frequency standards.
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© 2017 Informa UK Limited, trading as Taylor & Francis Group