Spectrally narrow optical transitions in trapped ions provide highly stable and accurate references for optical frequency standards. Due to low sensitivity to external perturbations, the 1S0 – 3P0 clock transition in 27Al+ ions is well suited for time keeping. The lack of a practical closed transition for cooling and state detection can be overcome by simultaneously trapping a logic ion (here 40Ca+ ), that can be directly cooled.
We aim to investigate quantum logic schemes for reliably reading out the quantum state of the clock ion.
Michael Guggemos, Milena Guevara-Bertsch, Óscar Andrey Herrera, Christian Roos, and Rainer Blatt