9th Symposium on Frequency Standards and Metrology

Session

SI Definition, Clocks and Time Scales II

18 Oct 2023, 08:30

Kingscliff, NSW, Australia

Conveners

SI Definition, Clocks and Time Scales II

• Michael Wouters

127. UTC(k) steered by intermittent operation of an optical clock

Tetsuya Ido (NICT)

18/10/2023, 08:30

SI definition, Clocks and Time Scales

Invited Oral

Since August 2021, NICT has been generating UTC(NICT) with its scale interval calibrated by the intermittent operation of a Sr lattice clock . The improvement in the deviation of UTC-UTC(NICT) as well as the current limitation will be discussed.

99. A definition of the SI second based on several optical transitions

Jérôme Lodewyck (LNE-SYRTE Observatoire de Paris)

18/10/2023, 09:00

SI definition, Clocks and Time Scales

Invited Oral

In this paper, we discuss the possibility to redefine the SI second using the geometric mean of several optical clock transitions. This definition would allow to take advantage of the many high performance optical frequency standards currently available.
Here, we describe the fundamental properties of this definition and its practical implementation. Finally, we discuss its strengths and...

50. Robust Optical Clocks for International Timescales (ROCIT)

Helen Margolis

18/10/2023, 09:30

SI definition, Clocks and Time Scales

Invited Oral

The recently concluded collaborative European project "Robust optical clocks for international timescales" (ROCIT) tackled some of the key challenges on the roadmap towards a redefinition of the second. The overall aim was to bring European optical clocks to the stage where they can contribute regularly to International Atomic Time as secondary representations of the second.