Ytterbium Optical Lattice Clock

We report on an optical clock based on the $^{1}$S$_{0}-^{3}$P$_{0}$ transition in neutral Yb atoms confined to a Stark shift-free optical lattice. Tight confinement of atoms to the Lamb-Dicke regime is shown to suppress Doppler- and recoil-related shifts, while the Stark shift-canceling technique eliminates the clock's first-order sensitivity to lattice intensity. Clocks based on magnetically-induced spectroscopy of $^{174}$Yb (I=0) and state-resolved spectroscopy of $^{171}$Yb (I=1/2) are demonstrated. Comparisons with other optical and microwave frequency standards via a self-referenced femtosecond frequency comb have enabled initial measurements of the absolute frequency and systematic effects with a fractional uncertainty of 10$^{-15}$, a level that can be reached in 10 seconds of averaging time.