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

2022/10/26 by Dörscher, Sören, Klose, Joshua, Palli, Sarath Maratha +1 · 1 citation
#Atomic Physics (physics.atom-ph) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2210.14727

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)]. This largely precludes operating strontium clocks with uncertainties of 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 polarizability difference using our ⁸⁷Sr lattice clock and find a value of Δα_qm = -987⁺¹⁷⁴_-223 μHz. This result is in very good agreement with the value reported by Ushijima et al.

Cited by

• Improved systematic evaluation of a strontium optical clock with uncertainty below 1 × 10 − 18

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