Dubé P, Madej AA, Bernard JE, Marmet L, Boulanger JS, Cundy S. Electric quadrupole shift cancellation in single-ion optical frequency standards.
Phys Rev Lett 2005;
95:033001. [PMID:
16090738 DOI:
10.1103/physrevlett.95.033001]
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Abstract
The electric quadrupole shift is presently the most significant source of uncertainty on the systematic shifts for several single-ion optical frequency standards. We present a simple method for cancelling this shift based on measurements of the Zeeman spectrum of the clock transition. This method is easy to implement and yields very high cancellation levels. A fractional uncertainty of 5 x 10(-18) for the canceled quadrupole shift is estimated for a measurement of the absolute frequency of the 5s (2)S(1/2)-4d (2)D(5/2) clock transition of 88Sr+.
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