Project summary

Publishable Summary (January 2021)


Guidelines on the evaluation and reporting of correlation coefficients between frequency ratio measurements (deliverable D3)
Helen Margolis and Marco Pizzocaro
(July 2020)


Intercontinental comparison of optical atomic clocks through very long baseline interferometry
M. Pizzocaro, M. Sekido, K. Takefuji, H. Ujihara, H. Hachisu, N. Nemitz, M. Tsutsumi, T. Kondo, E. Kawai, R. Ichikawa, K. Namba, Y. Okamoto, R. Takahashi, J. Komuro, C. Clivati, F. Bregolin, P. Barbieri, A. Mura, E. Cantoni, G. Cerretto, F. Levi, G. Maccaferri, M. Roma, C. Bortolotti, M. Negusini, R. Ricci, G. Zacchiroli, J. Roda, J. Leute, G. Petit, F. Perini, D. Calonico and T. Ido
Nature Physics (2020) – open access link will be provided after 6 month embargo period

Improved limits for violations of local position invariance from atomic clock comparisons
R. Lange, N. Huntemann, J. M. Rahn, C. Sanner, H. Shao, B. Lipphardt, C. Tamm, S. Weyers and E. Peik
Physical Review Letters 126, 011102 (2021)

Optical frequency ratio of a 171Yb+ single-ion clock and a 87Sr lattice clock
S. Dörscher, N. Huntemann, R. Schwarz, R. Lange, E. Benkler, B. Lipphardt, U. Sterr, E. Peik and C. Lisdat
Metrologia 58, 015005 (2021)

Universal formalism for data sharing and processing in clock comparison networks
J. Jodewyck, R. Le Targat, P.-E. Pottie, E. Benkler, S. Koke and J. Kronjäger
Physical Review Research 2, 043269 (2020)

Coherent suppression of tensor frequency shifts through magnetic field rotation
R. Lange, N. Huntemann, C. Sanner, H. Shao, B. Lipphardt, C. Tamm and E. Peik
Physical Review Letters 125, 143201 (2020)
Associated dataset

Long term measurement of the 87Sr clock frequency at the limit of primary Cs clocks
R. Schwarz, S. Dörscher, A. Al-Masoudi, E. Benkler, T. Legero, U. Sterr, S. Weyers, J. Rahm, B. Lipphardt and C. Lisdat
Physical Review Research 2, 033242 (2020)
Associated dataset

Coherent excitation of the highly forbidden electric octupole transition in 172Yb+
H. A. Fürst, C.-H. Yeh, D. Kalincev, A. P. Kulosa, L. S. Dreissen, R. Lange, E. Benkler, N. Huntemann, E. Peik and T. E. Mehlstäubler
Physical Review Letters 125, 163001 (2020)
Associated dataset

Absolute frequency measurement of the 1S03P0 transition of 171Yb with a link to International Atomic Time
M. Pizzocaro, F. Bregolin, P. Barbieri, B. Rauf, F. Levi and D. Calonico
Metrologia 57, 035007 (2020)
Associated dataset

End-to-end topology for fiber comb based optical frequency transfer at the 10-21 level
E. Benkler, B. Lipphardt, T. Puppe, R. Wilk, R. Rohde and U. Sterr
Optics Express 27, 36886 – 36902 (2019)
Associated dataset


Optical lattice clocks at NPL (seminar by William Bowden)


Funding statement: This project 18SIB05 ROCIT has received funding from the EMPIR programme co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation programme.

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