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  • Letter
  • Open Access

Experimental determination of the E2−M1 polarizability of the strontium clock transition

S. Dörscher, J. Klose, S. Maratha Palli*, and Ch. Lisdat†

  • Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

  • *Present address: Active Fiber Systems GmbH, Ernst Ruska Ring 17, 07745 Jena, Germany.
  • †christian.lisdat@ptb.de
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Phys. Rev. Research 5, L012013 – Published 7 February, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L012013

Abstract

To operate an optical lattice clock at a fractional uncertainty below 10−17, one must typically consider not only electric-dipole (E1) interaction between an atom and the lattice light field when characterizing the resulting lattice light shift of the clock transition but also higher-order multipole contributions, such as electric-quadrupole (E2) and magnetic-dipole (M1) interactions. However, strongly incompatible values have been reported for the E2−M1 polarizability difference of the clock states (5s5p)3P0 and (5s2)1S0 of strontium [Ushijima et al., Phys. Rev. Lett. 121, 263202 (2018); Porsev et al., Phys. Rev. Lett. 120, 063204 (2018); Wu et al., Phys. Rev. A 100, 042514 (2019)]. This largely precludes operating strontium clocks with uncertainties of a few 10−18, as the resulting lattice light shift corrections deviate by up to 1×10−17 from each other at typical trap depths. We have measured the E2−M1 light shift coefficient using our Sr87 lattice clock and find a value of Δαqm=−987−223+174µHz. This result is in very good agreement with the value reported by Ushijima et al. [Phys. Rev. Lett. 121, 263202 (2018)].

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References (24)

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Phys. Rev. Research 5, L012013– Published 7 February, 2023
  • Received 25 October 2022
  • Accepted 20 December 2022
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