|Title||Efficient Ground-State Cooling of Large Trapped-Ion Chains with an Electromagnetically-Induced-Transparency Tripod Scheme|
|Publication Type||Journal Article|
|Year of Publication||2020|
|Authors||L.. Feng, W.. L. Tan, A.. De, A.. Menon, A.. Chu, G.. Pagano, and C.. Monroe|
|Journal||Phys. Rev. Lett.|
|Date Published||JUL 29|
|Type of Article||Article|
We report the electromagnetically-induced-transparency (EIT) cooling of a large trapped Yb-171(+) ion chain to the quantum ground state. Unlike conventional EIT cooling, we engage a four-level tripod structure and achieve fast sub-Doppler cooling over all motional modes. We observe simultaneous groundstate cooling across the complete transverse mode spectrum of up to 40 ions, occupying a bandwidth of over 3 MHz. The cooling time is observed to be less than 300 mu s, independent of the number of ions. Such efficient cooling across the entire spectrum is essential for high-fidelity quantum operations using trapped ion crystals for quantum simulators or quantum computers.