title: Accurate optical lattice clock with 87Sr atoms.
abstract: We report a frequency measurement of the 1S0-3P0 transition of 87Sr atoms in an optical lattice clock. The frequency is determined to be 429 228 004 229 879(5) Hz with a fractional uncertainty that is comparable to state-of-the-art optical clocks with neutral atoms in free fall. The two previous measurements of this transition were found to disagree by about 2 x 10(-13), i.e., almost 4 times the combined error bar and 4 to 5 orders of magnitude larger than the claimed ultimate accuracy of this new type of clocks. Our measurement is in agreement with one of these two values and essentially resolves this discrepancy.
authors.affiliation: LNE-SYRTE, Observatoire de Paris 61, Avenue de l'Observatoire, 75014 Paris, France.
authors.forename: Rodolphe
authors.initials: R
authors.lastname: Le Targat
authors.forename: Xavier
authors.initials: X
authors.lastname: Baillard
authors.forename: Mathilde
authors.initials: M
authors.lastname: Fouché
authors.forename: Anders
authors.initials: A
authors.lastname: Brusch
authors.forename: Olivier
authors.initials: O
authors.lastname: Tcherbakoff
authors.forename: Giovanni D
authors.initials: GD
authors.lastname: Rovera
authors.forename: Pierre
authors.initials: P
authors.lastname: Lemonde