Swiss miniature atomic clock: First prototype and preliminary results

The first prototype of an eXtra Small Atomic Resonator (XSAR) was presented by CSEM at the 2009 EFTF conference. This paper describes the progress realized until 2011 towards the realization of a low-power miniature atomic clock. We here present the third generation of the prototype, merging for the first time the physics and electronics packages on a single printed circuit board.