Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster: Quantum Optics and Photonics II
Q 27.55: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
A cryogenic lattice clock at PTB — •Ali Al-Masoudi, Sören Dörscher, Roman Schwarz, Sebastian Häfner, Uwe Sterr, and Christian Lisdat — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
Optical clocks have been pushing the frontier of frequency metrology and hold strong promise for a broad range of applications, e.g., in fundamental physics and geosciences. Lattice clocks are particularly well suited for delivering on this promise, since they intrinsically exhibit the highest stabilities and thus support high-precision investigations of time-dependent effects that require short averaging times. The total systematic uncertainties of the best strontium lattice clocks have been limited by uncertainty of the black-body radiation (BBR) field and the resulting Stark shift for some time. However, different approaches for overcoming this limitation have recently been demonstrated in several groups, achieving fractional uncertainties in the low 10−18 regime and moving lattice clocks to the forefront in accuracy. Here, we report on the realisation of a cryogenic lattice clock at PTB. By interrogating the atoms in a uniform environment at cryogenic temperatures we achieve BBR-induced shift uncertainties of about 1 × 10−18. This enables a total systematic uncertainty below 1 × 10−17, which we are going to exploit in future clock comparisons.
This work is supported by QUEST, the DFG within CRC 1128 (geo-Q) and RTG 1729, and the EMRP within ITOC and QESOCAS. The EMRP is jointly funded by the EMRP-participating countries within EURAMET and the European Union.