We present NPL’s recent contributions to timekeeping applications of optical clocks. The first of these in-volves optical clocks at NPL and SYRTE being simultaneously used to steer experimental time scales, in a similar manner to Cs fountains steering the national time scales. The resulting optically-steered time scales at NPL and SYRTE (denoted UTCx(NPL) and UTCx(OP) respectively) will be presented along with compari-sons against both Coordinated Universal Time (UTC) and each other via satellite techniques.
We will then present how optical clocks can be used in the evaluation and steering of International Atomic Time (TAI) and, subsequently, UTC – a feat which has recently been achieved by NPL’s Sr lattice optical clock. We will discuss the process by which this was achieved, and we will show the recent frequency data and analysis that has been used to perform recent calibrations of TAI.
G. Barontini, V. Boyer, X. Calmet, N. Fitch, E. Forgan, R. Godun, J. Goldwin, V. Guarrera, I. Hill, M. Jeong, M. Keller, F. Kuipers, H. Margolis, P. Newman, L. Prokhorov, J. Rodewald, B. Sauer, M. Schioppo, N. Sherrill, M. Tarbutt, A. Vecchio, S. Worm
The QSNET consortium is building a UK network of next-generation atomic and molecular clocks that will
achieve unprecedented sensitivity in testing variations of the fine structure constant, α, and the electron-to-proton
mass ratio, μ. This in turn will provide more stringent constraints on a wide range of fundamental and
phenomenological theories beyond the Standard Model and on dark matter models.
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