Probe field ellipticity-induced shift in an atomic clock

Abstract

We investigate the probe field induced shift for atomic lattice-based and ion-trap clocks, which can be considered as a near resonant ac-Stark shift, connected to the Zeeman structure of atomic levels and their splitting in a dc magnetic field. This shift arises from possible residual ellipticity in the polarization of the probe field and uncertainty in the magnetic field orientation. Such a shift can have an arbitrary sign and, for some experimental conditions, can reach the fractional value of the order of 10${}^{-18}$-10${}^{-19}$, i.e., it is not negligible. Thus, it should be taken into account in the uncertainty budgets for the modern ultra-precise atomic clocks. In addition, it is shown that when using hyper-Ramsey spectroscopy, this shift can be reduced to a level much lower than $10^{-19}$.

8 pages, 6 figures

References in corpus (9)

• Systematic evaluation of an atomic clock at 2e-18 total uncertainty
• An ${}^{27}$Al${}^{+}$ quantum-logic clock with systematic uncertainty below $10^{-18}$
• Ultra-stable optical clock with two cold-atom ensembles
• A transportable optical lattice clock with $7\times 10^{-17}$ uncertainty
• Observation of the 1S0 - 3P0 clock transition in 27Al+
• A generalized Ramsey excitation scheme with suppressed light shift
• Towards a Transportable Aluminium Ion Quantum Logic Optical Clock
• Demonstration of the nearly continuous operation of an ${}^{171}$Yb optical lattice clock for half a year
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Cited by in corpus (2)

• ${}^{115}$In${}^{+}$-${}^{172}$Yb${}^{+}$ Coulomb crystal clock with $2.5\times 10^{-18}$ systematic uncertainty
• Improved absolute frequency measurement of ${}^{171}$Yb at NMIJ with uncertainty below $2\times 10^{-16}$