Electric quadrupole shift cancellation in single-ion optical frequency standards.
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+.
Dubé
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Institute for National Measurement Standards, National Research Council, Ottawa, Canada K1A 0R6. Pierre.Dube@nrc-cnrc.gc.ca
Madej
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Bernard
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Marmet
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Boulanger
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Cundy
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