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Q: Fachverband Quantenoptik und Photonik

Q 40: Precision Spectroscopy of Atoms and Ions III (joint session A/Q)

Q 40.8: Talk

Thursday, March 14, 2024, 12:45–13:00, HS 1010

Comparison of Sr lattice clocks from Japan, UK, and Germany — •Tim Lücke¹, Clock Teams^1,2,3,4,8, and Link Teams^1,2,5,6,7 — ¹PTB, Braunschweig, Deutschland — ²NPL, London, UK — ³RIKEN, Tokyo, Japan — ⁴University of Tokyo, Tokyo, Japan — ⁵LNE-SYRTE, Paris, France — ⁶LPL, Paris, France — ⁷RENATER, Paris, France — ⁸University of Birmingham, Birmingham, UK

We present a measurement campaign investigating the agreement of state-of-the-art optical clocks from Japan and Europe. Two transportable Sr lattice clocks from RIKEN in Japan [1] and PTB in Germany were compared with the stationary Sr clocks at NPL in London [2] and PTB in Braunschweig. In addition to local comparisons an interferometric fiber [3] link was used to compare the clocks remotely. The data will also be analyzed with respect to chronometric leveling as a geodetic application.

[1] M. Takamoto et al., Nat. Photonics 14, 411-415 (2020).

[2] R. Hobson et al., Metrologia 57 065026 (2020).

[3] M. Schioppo et al., Nat. Commun. 13, 212 (2022).

Keywords: optical clock; lattice clock; transportable optical clock; clock comparison; chronometric leveling