Opticlock: Transportable and Easy-to-Operate Optical Single-Ion Clock

Ritter, Stephan; Hafiz, Moustafa Abdel; Arar, Bassem; Bawamia, Ahmad; Bergner, Klaus; Biethahn, Maximilian; Brakhane, Stefan; Alexandre, Didier; Fortágh, Jószef; Halder, Matthaus; Holzwarth, Ronald; Huntemann, N.; Johanning, M.; Jördens, Robert; Kaenders, Wilhelm; Karlewski, Florian; Kienle, Florian; Krutzik, Markus; Lessing, Maurice; Meschede, Dieter; Peik, Ekkehard; Peters, A. S.; Schmidt, Piet O.; Siebeneich, Hendrik; Stühler, J.; Tamm, Chr.; Vogt, Enrico; Wicht, Andreas; Wunderlich, Christof

doi:10.1364/quantum.2020.qth5b.6

Cited by 1 publication

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“…Some groups have demonstrated high clock operation uptimes, for example 80.3% for a duration of 6 months [42], 93.8% uptime for a period of 10 d [44]. More recently fully autonomous operation for 2 weeks with 99.8% uptime at 2 × 10 −17 systematic uncertainty inside a laboratory has been demonstrated for the OptiClock based on the E2 transition of 171 Yb + [64,65]. The system fits inside the volume of two 19 inch racks and has been developed by PTB jointly with industry [65].…”

Section: Ongoing Research Activities and Future Prospects For Optical...mentioning

confidence: 99%

Roadmap towards the redefinition of the second

Dimarcq,

Gertsvolf,

Mileti

et al. 2024

Metrologia

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This paper outlines the roadmap towards the redefinition of the second, which was recently updated by the CCTF Task Force created by the CCTF in 2020. The main achievements of optical frequency standards (OFS) call for reflection on the redefinition of the second, but open new challenges related to the performance of the optical frequency standards, their contribution to time scales and UTC, the possibility of their comparison, and the knowledge of the Earth’s gravitational potential to ensure a robust and accurate capacity to realize a new definition at the level of 10-18 uncertainty. The mandatory criteria to be achieved before redefinition have been defined and their current fulfilment level is estimated showing the fields that still needed improvement. The possibility to base the redefinition on a single or on a set of transitions has also been evaluated. The roadmap indicates the steps to be followed in the next years to be ready for a sound and successful redefinition.

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