Sympathetic Electromagnetically-Induced-Transparency Laser Cooling of Motional Modes in an Ion Chain
Yiheng Lin, John Gaebler, Ting Rei Tan, R. Bowler, John D. Jost, D. Leibfried, D. J. Wineland · Physical Review Letters · 2013
We use electromagnetically-induced-transparency laser cooling to cool motional modes of a linear ion chain. As a demonstration, we apply electromagnetically-induced-transparency cooling on $^{24}\mathrm{Mg}^{+}$ ions to cool the axial modes of a $^{9}\mathrm{Be}^{+}\mathrm{\text{\ensuremath{-}}}^{24}\mathrm{Mg}^{+}$ ion pair and a $^{9}\mathrm{Be}^{+}\mathrm{\text{\ensuremath{-}}}^{24}\mathrm{Mg}^{+}\mathrm{\text{\ensuremath{-}}}^{24}\mathrm{Mg}^{+}\mathrm{\text{\ensuremath{-}}}^{9}\mathrm{Be}^{+}$ ion chain, thereby sympathetically cooling the $^{9}\mathrm{Be}^{+}$ ions. Compared to previous implementations of conventional Raman sideband cooling, we achieve approximately an order-of-magnitude reduction in the duration required to cool the modes to near the ground state and significant reduction in required laser intensity.