Sympathetic cooling of trapped Cd+ isotopes -: art. no. 040304

We sympathetically cool a trapped Cd-112(+) ion by directly Doppler cooling a Cd-114(+) ion in the same trap. This is the first demonstration of optically addressing a single trapped ion being sympathetically cooled by a different species ion. Notably, the experiment uses a single laser source, and does not require strong focusing. This paves the way toward reducing decoherence in an ion trap quantum computer based on Cd+ isotopes.