High-accuracy measurement of the differential scalar polarizability of a Sr+ 88 clock using the time-dilation effect

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DOIResolve DOI: http://doi.org/10.1103/PhysRevLett.112.173002
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TypeArticle
Journal titlePhysical Review Letters
ISSN1079-7114
Volume112
Issue17
Article number173002
SubjectAntenna radiation; Electric fields; Frequency shift keying; Frequency standards; Polarization; Black body radiation; Dynamic correction; Field evaluation; High-accuracy measurements; Reference standard; Scalar polarizability; Shift coefficients; Total uncertainties; Ions
AbstractWe report a high-accuracy measurement of the differential static scalar polarizability Δα0 of the 5sS1/22-4dD5/22 transition of the Sr+88 ion. The high accuracy is obtained by comparing the micromotion-induced positive scalar Stark shift to the negative time-dilation shift. Measurement of the trap drive frequency where these shifts cancel is used to determine Δα0 without the need to determine the electric field. Δα0 is a critical parameter for the operation of frequency standards as it determines the blackbody radiation frequency shift coefficient, the largest source of uncertainty in the Sr+88 ion clock. The measured value of Δα0 is -4.7938(71)×10-40Jm2/V2. Taking into account the dynamic correction, the blackbody shift at 300 K is 0.24799(37) Hz. The contribution of the blackbody shift coefficient to the uncertainty of the ion standard has been reduced by a factor of 24, from 2×10-17 to 8.3×10-19. The revised total uncertainty of our reference standard is 1.2×10-17, limited by the blackbody field evaluation. An additional benefit of the low uncertainty of Δα0 is the ability to suppress, by a factor of about 200, the net micromotion frequency shifts. © 2014 Published by the American Physical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Measurement Science and Standards (MSS-SME)
Peer reviewedYes
NPARC number21272226
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Record identifier2bc131ab-7cb8-4b94-85df-9cec7333bd8b
Record created2014-07-23
Record modified2016-05-09
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