SAMOP 2023 – scientific programme

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QI: Fachverband Quanteninformation

QI 27: Precision Measurements with Optical Clocks (joint session Q/QI)

QI 27.6: Talk

Thursday, March 9, 2023, 12:30–12:45, E001

E2-M1 polarisability of the strontium clock transition at the 813 nm lattice magic wavelength — •Joshua Klose, Sören Dörscher, and Christian Lisdat — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

To accurately determine the frequency shift of the clock transition caused by the optical lattice with fractional uncertainty of 10⁻¹⁷ or below, one must account for electric-quadrupole (E2) and magnetic-dipole (M1) interactions in a strontium lattice clock. However, the values of the E2-M1 polarisability difference of the clock states, (5s²) ¹S₀ and (5s5p) ³P₀, found in recent publications [1, 2] exhibit large discrepancies. We report on an independent experimental determination of the differential E2-M1 polarisability, Δα_qm, by measuring the differential light lattice shift between samples with different motional state distributions, leveraging the different dependence of the light shift terms on the atomic motional state. We find a value of Δα_qm=−987₋₂₂₃⁺¹⁷⁴ µ Hz, which is in agreement with the value reported in Ref. [1] as well as the result of another recent investigation [3].

This project has been supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy – EXC-2123 QuantumFrontiers – Project-ID 390837967, SFB 1464 TerraQ – Project-ID 434617780 – within project A04, and SFB 1227 DQ-mat – Project-ID 274200144 – within project B02.
[1] I. Ushijima et al., Phys. Rev. Lett. 121, 263202 (2018)
[2] S. G. Porsev et al., Phys. Rev. Lett. 120, 063204 (2018)
[3] K. Kim et al., arXiv:2210.16374 (2022)