title: Absolute measurement of the 1S0 - 3P0 clock transition in neutral 88Sr over the 330 km-long stabilized fibre optic link.
abstract: We report a stability below 7 × 10(-17) of two independent optical lattice clocks operating with bosonic (88)Sr isotope. The value (429 228 066 418 008.3(1.9)(syst) (0.9)(stat) Hz) of the absolute frequency of the (1)S(0) - (3)P(0) transition was measured with an optical frequency comb referenced to the local representation of the UTC by the 330 km-long stabilized fibre optical link. The result was verified by series of measurements on two independent optical lattice clocks and agrees with recommendation of Bureau International des Poids et Mesures.
authors.affiliation: Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziądzka 5, PL-87-100 Toruń, Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Morzyński
authors.affiliation: Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziądzka 5, PL-87-100 Toruń, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Bober
authors.affiliation: Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziądzka 5, PL-87-100 Toruń, Poland.
authors.forename: Dobrosława
authors.initials: D
authors.lastname: Bartoszek-Bober
authors.affiliation: Time and Frequency Department, Astrogeodynamic Observatory of Space Research Center, Borowiec, Drapałka 4, PL-62-035 Kórnik, Poland.
authors.forename: Jerzy
authors.initials: J
authors.lastname: Nawrocki
authors.affiliation: Department of Electronics, AGH University of Science and Technology, al. Mickiewicza 30, PL-30-059, Kraków, Poland.
authors.forename: Przemysław
authors.initials: P
authors.lastname: Krehlik
authors.affiliation: Department of Electronics, AGH University of Science and Technology, al. Mickiewicza 30, PL-30-059, Kraków, Poland.
authors.forename: Łukasz
authors.initials: Ł
authors.lastname: Śliwczyński
authors.affiliation: Department of Electronics, AGH University of Science and Technology, al. Mickiewicza 30, PL-30-059, Kraków, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Lipiński
authors.affiliation: Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziądzka 5, PL-87-100 Toruń, Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Masłowski
authors.affiliation: Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziądzka 5, PL-87-100 Toruń, Poland.
authors.forename: Agata
authors.initials: A
authors.lastname: Cygan
authors.affiliation: Time and Frequency Department, Astrogeodynamic Observatory of Space Research Center, Borowiec, Drapałka 4, PL-62-035 Kórnik, Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Dunst
authors.affiliation: Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziądzka 5, PL-87-100 Toruń, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Garus
authors.affiliation: Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziądzka 5, PL-87-100 Toruń, Poland.
authors.forename: Daniel
authors.initials: D
authors.lastname: Lisak
authors.affiliation: M. Smoluchowski Institute of Physics, Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, St. Łojasiewicza 11, PL-30-348 Kraków, Poland.
authors.forename: Jerzy
authors.initials: J
authors.lastname: Zachorowski
authors.affiliation: M. Smoluchowski Institute of Physics, Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, St. Łojasiewicza 11, PL-30-348 Kraków, Poland.
authors.forename: Wojciech
authors.initials: W
authors.lastname: Gawlik
authors.affiliation: Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5, PL-02-093 Warsaw, Poland.
authors.forename: Czesław
authors.initials: C
authors.lastname: Radzewicz
authors.affiliation: Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziądzka 5, PL-87-100 Toruń, Poland.
authors.forename: Roman
authors.initials: R
authors.lastname: Ciuryło
authors.affiliation: Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziądzka 5, PL-87-100 Toruń, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Zawada