Studies of the $^{1}$S$_{0}$--$^3$P$_0$ transition in atomic ytterbium   for optical clocks and qubit arrays
  We report an observation of the weak $6^{1}$S$_{0}$-$6^3$P$_0$ transition in $^{171,173}$Yb as an important step to establish Yb as a primary candidate for future optical frequency standards, and to open up a new approach for qubits using the $^{1}$S$_{0}$ and $^3$P$_0$ states of Yb atoms in an optical lattice. 
Tao Hong, Claire Cramer, Eryn Cook, Warren Nagourney, E. N. Fortson