Related papers: Transportable strontium lattice clock with $4 \times 10^{-19}$ blackbody radiation shift uncertainty

Transportable strontium lattice clock with $4 \times 10^{-19}$ blackbody radiation shift uncertainty

URL: http://arxiv.org/abs/2507.14030v1
Date: Fri, 18 Jul 2025 15:57:32 GMT
Title: Transportable strontium lattice clock with $4 \times 10^{-19}$ blackbody radiation shift uncertainty
Authors: I. Nosske, C. Vishwakarma, T. Lücke, J. Rahm, N. Poudel, S. Weyers, E. Benkler, S. Dörscher, C. Lisdat,
Abstract summary: The blackbody radiation shift is controlled at the level of $4.0 times 10-19$, as the atoms are interrogated inside a well-characterised, cold thermal shield.<n>Using a transportable clock laser, the clock reaches a frequency instability of about $5 times 10-16/sqrttau/mathrms$, which enables fast reevaluations of systematic effects.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We describe a transportable optical lattice clock based on the $^1\mathrm{S}_0 \rightarrow {^3\mathrm{P}_0}$ transition of lattice-trapped $^{87}$Sr atoms with a total systematic uncertainty of $2.1 \times 10^{-18}$. The blackbody radiation shift, which is the leading systematic effect in many strontium lattice clocks, is controlled at the level of $4.0 \times 10^{-19}$, as the atoms are interrogated inside a well-characterised, cold thermal shield. Using a transportable clock laser, the clock reaches a frequency instability of about $5 \times 10^{-16}/\sqrt{\tau/\mathrm{s}}$, which enables fast reevaluations of systematic effects. By comparing this clock to the primary caesium fountain clocks CSF1 and CSF2 at Physikalisch-Technische Bundesanstalt, we measure the clock transition frequency with a fractional uncertainty of $1.9\times 10^{-16}$, in agreement with previous results. The clock was successfully transported and operated at different locations. It holds the potential to be used for geodetic measurements with centimetre-level or better height resolution and for accurate inter-institute frequency comparisons.

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