Zobrazeno 1 - 10
of 265
pro vyhledávání: '"Guéna J"'
Autor:
Riedel, F., Al-Masoudi, A., Benkler, E., Dörscher, S., Gerginov, V., Grebing, C., Häfner, S., Huntemann, N., Lipphardt, B., Lisdat, C., Peik, E., Piester, D., Sanner, C., Tamm, C., Weyers, S., Denker, H., Timmen, L., Voigt, C., Calonico, D., Cerretto, G., Costanzo, G. A., Levi, F., Sesia, I., Achkar, J., Guèna, J., Abgrall, M., Rovera, D., Chupin, B., Shi, C., Bilicki, S., Bookjans, E., Lodewyck, J., Targat, R. Le, Delva, P., Bize, S., Baynes, F. N., Baynham, C. F. A., Bowden, W., Gill, P., Godun, R. M., Hill, I. R., Hobson, R., Jones, J. M., King, S. A., Nisbet-Jones, P. B. R., Rolland, A., Shemar, S. L., Whibberley, P. B., Margolis, H. S.
We carried out a 26-day comparison of five simultaneously operated optical clocks and six atomic fountain clocks located at INRIM, LNE-SYRTE, NPL and PTB by using two satellite-based frequency comparison techniques: broadband Two-Way Satellite Time a
Externí odkaz:
http://arxiv.org/abs/1910.06736
Autor:
Guéna, J., Weyers, S., Abgrall, M., Grebing, C., Gerginov, V., Rosenbusch, P., Bize, S., Lipphardt, B., Denker, H., Quintin, N., Raupach, S. M. F., Nicolodi, D., Stefani, F., Chiodo, N., Koke, S., Kuhl, A., Wiotte, F., Meynadier, F., Camisard, E., Chardonnet, C., Coq, Y. Le, Lours, M., Santarelli, G., Amy-Klein, A., Targat, R. Le, Lopez, O., Pottie, P. E., Grosche, G.
Publikováno v:
Metrologia 54 (2017) 348
We report on the first comparison of distant caesium fountain primary frequency standards (PFSs) via an optical fiber link. The 1415 km long optical link connects two PFSs at LNE-SYRTE (Laboratoire National de m\'{e}trologie et d'Essais - SYst\`{e}me
Externí odkaz:
http://arxiv.org/abs/1703.02892
Publikováno v:
Phys. Rev. Lett. 117, 061301 (2016)
We use six years of accurate hyperfine frequency comparison data of the dual rubidium and caesium cold atom fountain FO2 at LNE-SYRTE to search for a massive scalar dark matter candidate. Such a scalar field can induce harmonic variations of the fine
Externí odkaz:
http://arxiv.org/abs/1604.08514
Autor:
Tyumenev, R, Favier, M, Bilicki, S, Bookjans, E, Targat, R Le, Lodewyck, J, Nicolodi, D, Coq, Y Le, Abgrall, M, Guéna, J, De Sarlo, L, Bize, S
Publikováno v:
New Journal of Physics, 18 113002 (2016)
In this paper we report the evaluation of an optical lattice clock based on neutral mercury down to a relative uncertainty of $1.7\times 10^{-16}$. Comparing this characterized frequency standard to a Cs atomic fountain we determine the absolute freq
Externí odkaz:
http://arxiv.org/abs/1603.02026
Autor:
Abgrall, M., Chupin, B., De Sarlo, L., Guéna, J., Laurent, Ph., Coq, Y. Le, Targat, R. Le, Lodewyck, J., Lours, M., Rosenbusch, P., Rovera, D., Bize, S.
Publikováno v:
Comptes Rendus Physique Volume 16, Issue 5, June 2015, Pages 461 to 470
In this article, we report on the work done with the LNE-SYRTE atomic clock ensemble during the last 10 years. We cover progress made in atomic fountains and in their application to timekeeping. We also cover the development of optical lattice clocks
Externí odkaz:
http://arxiv.org/abs/1507.04623
Autor:
Tobar, M. E., Stanwix, P. L., McFerran, J. J., Guéna, J., Abgrall, M., Bize, S., Clairon, A., Laurent, Ph., Rosenbusch, P., Rovera, D., Santarelli, G.
The frequencies of three separate Cs fountain clocks and one Rb fountain clock have been compared to various hydrogen masers to search for periodic changes correlated with the changing solar gravitational potential at the Earth and boost with respect
Externí odkaz:
http://arxiv.org/abs/1306.1571
Autor:
Targat, R. Le, Lorini, L., Coq, Y. Le, Zawada, M., Guéna, J., Abgrall, M., Gurov, M., Rosenbusch, P., Rovera, D. G., Nagórny, B., Gartman, R., Westergaard, P. G., Tobar, M. E., Lours, M., Santarelli, G., Clairon, A., Bize, S., Laurent, P., Lemonde, P., Lodewyck, J.
Publikováno v:
Nature Communication 4, 2109 (July 2013)
Progress in realizing the SI second had multiple technological impacts and enabled to further constraint theoretical models in fundamental physics. Caesium microwave fountains, realizing best the second according to its current definition with a rela
Externí odkaz:
http://arxiv.org/abs/1301.6046
Autor:
Guéna, J., Rosenbusch, P., Laurent, Ph., Abgrall, M., Rovera, D., Lours, M., Santarelli, G., Tobar, M. E., Bize, S., Clairon, A.
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 57, 647 (2010)
We report the operation of a dual Rb/Cs atomic fountain clock. 133Cs and 87Rb atoms are cooled, launched, and detected simultaneously in LNE-SYRTE's FO2 double fountain. The dual clock operation occurs with no degradation of either the stability or t
Externí odkaz:
http://arxiv.org/abs/1301.0483
Publikováno v:
Phys. Rev. Lett. 108, 183004 (2012)
We present an assessment of the (6s^{2})1S0 -> (6s7s)3P0 clock transition frequency in 199Hg with an uncertainty reduction of nearly three orders of magnitude and demonstrate an atomic quality factor, Q, of ~10^(14). The 199Hg atoms are confined in a
Externí odkaz:
http://arxiv.org/abs/1201.3544
Autor:
Millo, J., Abgrall, M., Lours, M., English, E. M. L., Jiang, H., Guena, J., Clairon, A., Bize, S., Coq, Y. Le, Santarelli, G., Tobar, M. E.
Publikováno v:
Applied Physics Letters, 94, 141105 (2009)
We demonstrate the use of a fiber-based femtosecond laser locked onto an ultra-stable optical cavity to generate a low-noise microwave reference signal. Comparison with both a liquid Helium cryogenic sapphire oscillator (CSO) and a Ti:Sapphire-based
Externí odkaz:
http://arxiv.org/abs/0901.3654