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Q: Fachverband Quantenoptik und Photonik
Q 59: Poster IV
Q 59.43: Poster
Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof
A strontium lattice clock with 3 × 10−18 uncertainty — •Kilian Stahl, Joshua Klose, Roman Schwarz, Ingo Nosske, Uwe Sterr, Sören Dörscher, and Christian Lisdat — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
We present a strontium optical lattice clock, PTB-Sr3, that is equipped with in-vacuum heat shields providing a highly homogeneous thermal environment. Initial characterisation of systematic effects yields a fractional frequency uncertainty of about 3 × 10−18. The clock has similar frequency instability as its predecessor, i.e., below 2 × 10−16 / √τ / s, and improved availability due to automated monitoring and recovery of laser frequency locks. We also report on a revisiting analysis of the atomic response to blackbody radiation (BBR), which reveals a previously unrecognised error in the dynamic correction coefficient corresponding to a 4 × 10−18 clock offset and improves the uncertainty of the atomic response near room temperature to about 1 × 10−18. To improve the uncertainty of the BBR-induced frequency shift further, a closed-cycle cryocooler allows reducing the temperature of the heat shields to below 80 K. We discuss the prospects for improving the fractional frequency uncertainty of this clock into the 10−19 regime.
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.