Overview of Highly Accurate RF and Optical Frequency Standards at the National Research Council of Canada

We describe progress towards ultra-accurate and stable standards of frequency and time at the National Research Council of Canada (NRC). Emphasis is placed on the research associated with creating a reliable and workable optical frequency standard and secondary realization of the second based on a single trapped and laser cooled ion of strontium at 445 THz. Work is described on recent results of probe resolution, stability, and the ability to connect this reference frequency with existing and developed RF standards at NRC. An overview is also presented of the group's progress in the development of a Cs fountain based standard for the realization of the second and upcoming determinations of the reference single ion frequency.