International timescales with optical clocks (ITOC)
Abstract
A new collaborative European project “International timescales with optical clocks” (ITOC) aims to tackle the key challenges that must be addressed prior to a redefinition of the SI second. A coordinated programme of comparisons will be carried out between European optical clocks developed in five different laboratories, enabling their performance levels to be validated at an unprecedented level of accuracy. Supporting work will be carried out to evaluate relativistic effects that influence the comparisons, including the gravitational redshift of the clock transition frequencies. A proof-of-principle experiment will also be performed to demonstrate that optical clocks could be used to make direct measurements of the Earth's gravity potential with high temporal resolution.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
EGG2015 is the latest European gravimetric quasigeoid model; its major differences from EGG2008 are the inclusion of additional gravity measurements around major European optical clock sites within the ITOC project and the use of a newer GOCE-based geopotential model instead of EGM2008.
“The major differences between EGG2015 and the previous EGG2008 model (Denker 2013) are the inclusion of additional gravity measurements carried out recently around all major European optical clock sites within the ITOC project (Margolis et al. 2013; Margolis 2014; see also http://projects. npl.co.uk/itoc/) and the use of a newer geopotential model based on the GOCE satellite mission instead of EGM”
From Geodetic methods to determine the relativistic redshift at the level of 10 $$^{-18}$$ - 18 in the context of international timescales: a review and practical results (2018) · cites this paper as Margolis et al. 2013
The major differences between EGG2015 and EGG2008 are the inclusion of additional gravity measurements around the ITOC clock sites and the use of a newer geopotential model based on GOCE instead of EGM2008.
“The major differences between EGG2015 and the previous EGG2008 model [134] are the inclusion of additional gravity measurements carried out recently around the aforementioned ITOC clock sites [60] and the use of a newer geopotential model based on the GOCE satellite mission instead of EGM2008.”
From Chronometric Geodesy: Methods and Applications (2019) · cites this paper as [60]
Cites
The<sup>87</sup>Sr optical frequency standard at PTB
Falke, S., Schnatz, H., Winfred, J. S. R. V., Middelmann, T., Vogt, S., Weyers, S., Lipphardt, B., Grosche, G., Riehle, F., Sterr, U., et al. (2011) · Metrologia · doi:10.1088/0026-1394/48/5/022 · Cited by 129 · see citing works
Self-citation
Flagged first, then by citations
Cited by
Sorted by citations
Denker, H., Timmen, L., Voigt, C., Weyers, S., Peik, E., Margolis, H. S., Delva, P., Wolf, P., & Petit, G. (2018) · Journal of Geodesy · doi:10.1007/s00190-017-1075-1 · Cited by 91 · see citing works
Intercontinental comparison of optical atomic clocks through very long baseline interferometry
Pizzocaro, M., Sekido, M., Takefuji, K., Ujihara, H., Hachisu, H., Nemitz, N., Tsutsumi, M., Kondo, T., Kawai, E., Ichikawa, R., et al. (2021) · Nature Physics · doi:10.1038/s41567-020-01038-6 · Cited by 64 · see citing works
Self-citationVoigt, C., Denker, H., & Timmen, L. (2016) · Metrologia · doi:10.1088/0026-1394/53/6/1365 · Cited by 50 · see citing works
Self-citationRelativistic corrections for time and frequency transfer in optical fibres
Geršl, J., Delva, P., & Wolf, P. (2015) · Metrologia · doi:10.1088/0026-1394/52/4/552 · Cited by 40 · see citing works
“The work was done within an EMRP project International Time Scales with Optical Clocks and the related Research Mobility Grant.”
BackgroundSelf-citationMargolis, H. S., & Gill, P. (2015) · Metrologia · doi:10.1088/0026-1394/52/5/628 · Cited by 40 · see citing works
Self-citationBaynham, C. F. A., Godun, R. M., Jones, J. M., King, S. A., Nisbet-Jones, P. B. R., Baynes, F., Rolland, A., Baird, P. E. G., Bongs, K., Gill, P., et al. (2018) · Journal of Modern Optics · doi:10.1080/09500340.2017.1384514 · Cited by 32 · see citing works
Self-citationExploring potential applications of optical lattice clocks in a plate subduction zone
Tanaka, Y., & Katori, H. (2021) · Journal of Geodesy · doi:10.1007/s00190-021-01548-y · Cited by 31 · see citing works
Chronometric Geodesy: Methods and Applications
Delva, P., Denker, H., & Lion, G. (2019) · Fundamental Theories of Physics · doi:10.1007/978-3-030-11500-5_2 · Cited by 28 · see citing works
“escales. The major dierences between EGG2015 and the previous EGG2008 model [134] are the inclusion of additional gravity measurements carried out recently around the aforementioned ITOC clock sites [60] and the use of a newer geopotential model based on the GOCE satellite mission instead of EGM2008. The new gravity m…”
BackgroundMethodInfluentialSelf-citation
- Authors
- Margolis, H. S., Godun, R. M., Gill, P., Johnson, L. A. M., Shemar, S. L., Whibberley, P. B., Calonico, D., Levi, F., Lorini, L., Pizzocaro, M., Delva, P., Bize, S., Achkar, J., Denker, H., Timmen, L., Voigt, C., Falke, S., Piester, D., Lisdat, C., Sterr, U., Vogt, S., Weyers, S., Gersl, J., Lindvall, T., & Merimaa, M.
- Affiliations
- National Physical Laboratory (GB)
- Leibniz University Hannover (DE)
- Istituto Nazionale di Ricerca Metrologica (IT)
- Physikalisch-Technische Bundesanstalt (DE)
- National metrology institute VTT MIKES (FI)
- ORCID
- Venue
- 2013 Joint European Frequency and Time Forum & International Frequency Control Symposium (EFTF/IFC)
- Publisher
- IEEE
- Published
- 2013-07
- Pages
- 908-911
- ISSN
- 1075-6787 (ISSN-L)
- OpenAlex
- W2023494863
- Cited by
- 15
- References
- 1
- Citations by year
- 2021: 1 · 2020: 1 · 2019: 2 · 2018: 1 · 2017: 4 · 2016: 3 · 2015: 3
- FWCI
- 8.02
- Type
- conference paper
- Language
- en
- Open access
- closed
- Locations
- Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS) (publishedVersion)
- HAL (submittedVersion)
- CINECA IRIS Institutional Research Information System (IRIS Istituto Nazionale di Ricerca Metrologica) (submittedVersion)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Advanced Frequency and Time Standards
- Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Scientific Measurement and Uncertainty Evaluation
- Physical Sciences › Computer Science › Computer Networks and Communications › Network Time Synchronization Technologies
- Keywords
- optical clocks, time scales, clock comparison, gravitational redshift, relativistic effects, temporal resolution
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
