Скачать или смотреть The CCTF Roadmap to the Redefinition of the Second | Keynote by Dr Marina Gertsvolf

In this presentation delivered during the 150th anniversary celebrations of the Bureau International des Poids et Mesures (BIPM), Dr Marina Gertsvolf presents the work of the Consultative Committee for Time and Frequency (CCTF) and the wider time and frequency community towards the redefinition of the SI second.

She explains why the second underpins the entire SI system, outlines the historical transition from astronomical to atomic time, and traces the rapid advances in optical atomic clocks that now exceed the performance of cesium standards. Dr Gertsvolf introduces the CCTF roadmap, the criteria required for redefinition, and the international coordination needed to ensure accessibility, stability and long-term robustness.

The talk also explores the different options under consideration for redefining the second — including single-species and ensemble-based approaches — and highlights the technical, conceptual and communication challenges involved as the community moves towards a possible decision at the CGPM in 2026.

🎥 This video is intended for metrologists, time and frequency specialists, physicists, standards developers, policymakers and anyone interested in the future of the SI and the foundations of precision timekeeping.

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